- 1 Ubuntu
- 2 Installation documentation
- 3 Upgrading Ubuntu 14.04 to 16.04 LTS
- 4 Ubuntu upgrades
- 5 Networking, file systems and users
- 6 Displays
- 7 Sounds / Bell / beep
- 8 Desktop
- 9 Hot keys for the brave
- 10 Packages
- 11 Printers
- 12 X Windows
- 13 Java
- 14 Sound
- 15 Application hints
- 16 Non-standard software
- 17 Security
- 18 Opinions and alternatives
- 19 Links
- This page so far is by no means a configuration and installation guide, but it contains some information that could be of use to some people. Daniel K. Schneider decided to put some of his installation notes in this wiki, so he won't loose them.
- I am be no means a systems expert. As you can see from other entries in this wiki I deal with lots of stuff and lots of it I don't really master ...
- Feel encouraged to add stuff :)
1.1 Identify your machine and system
Find out what distribution you already have:
more /etc/issue uname -a
Find the serial number for your machine (e.g. a Dell service tag)
sudo dmidecode -s system-serial-number
- However, this may not work. E.g. on my new Dell Precision tower, this fails (as of June 2017)
2 Installation documentation
Start with the official Ubuntu site (sometimes a bit lengthy):
Sometimes it is useful to hunt down short installation documentation on other sites than Ubuntu. If you are looking for an other practical, short and excellent installation guides (and that may include how to add non-free software):
After installing (Thanx a lot to you guys, the articles below really did help me to get a somewhat decent working environment - Daniel K. Schneider 22:06, 20 September 2012 (CEST))
3 Upgrading Ubuntu 14.04 to 16.04 LTS
This upgrade was available since July 21 2016 (16.04.1 LTS)
Upgrade to latest 14.04 (not sure that this is really needed)
sudo apt-get update sudo apt-get dist-upgrade sudo apt-get autoremove
Upgrade to 16.04 LTS
If this doesn't work, try
sudo update-manager -d
3.1 Upgrading a DELL Precision tower
Even in April 2017, a high end DELL desktop workstation comes with Ubuntu 14LTS (pre-installed). I got a 5810 tower with a Xeon E5-1620 v3 (Four Core HT, 10MB Cache, 3.5GHz Turbo, a 500GB SSD and a NVIDIA® Quadro® M4000 8Go graphics card. That system does not want to upgrade, or at least mine would not.
- Ubuntu certification is 14.04 LTS 64-bit
- Doing the steps above broke the GUI (Can't log in anymore). This is not related to upgrading to 16LTS but still a big hassle (see below)
- From a terminal (hit CTL-ALT-F1), the do-relase-upgrade command won't find any upgrades. It says:
No new release found
Someone (at DELL) decided that you should not update, so
iff you believe that you should upgrade, then change this setting even before any upgrading / updating to newer 14LTS packages.
/etc/update-manager/release-upgradesand set Prompt=lts
If your system is new (like mine), you could use the Nano editor, e.g. type:
sudo nano /etc/update-manager/release-upgrades
This went pretty well, except that the the GUI was still broken. Nvidia drivers are proprietary and even if you install new ones from the graphics repository (see below), I could not login.
To fix that:
- Disable secure boot (sorry I was too fed up to take notes, but), the most important part is;
- run a terminal: CTL-ALT-F1, then type:
- Then enter a password you can remember, e.g. yours, and then immediately reboot. It will then ask you to enter the password you just gave in a weird way, character by character.
Now I could log into the system, but the there was no desktop (i.e. compiz was broken). There was only the graphics layer. With that you can still open open a terminal (right click) but it cannot be moved since compiz did not work. In order to get the control center, you could type in terminal:
... but there is nothing in there that would fixing the problem. However, you can create a new user (see below)
Solution: Kill yourself and get a new better self. Do do so:
- Create a new user with root privileges, e.g. call it admin (and so make sure that he/she got these privileges !!)
- Kill your user
- Create a new one. Also consider getting good uid and gid values, e.g. the same that you would have on other machines in your network.
- This is not the first time I have trouble installing or upgrading a Linux desktop. Windows is so much easier. However once Ubuntu is up and running I feel more comfortable with it.
- On the positive side, this DELL machine does seem to be fast, e.g. will load 3.5 Mio Meshes into Meshlab really fast. It even can play games through Steam. It also is very silent.
4 Ubuntu upgrades
4.1 Which version do I run
4.2 Minor upgrades
From the command line, to update the repository information:
sudo apt-get update
sudo apt-get dist-upgrade
- will do the upgrade fairly smartly (make sure that all dependencies work)
sudo apt-get dist-upgrade
- will upgrade the existing packages to the latest version
4.3 Hash Sum mismatch issues
If something like GPG error: http://mirror.switch.ch hardy-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <email@example.com> happens, you might change the server. Either,
- Edit /etc/apt/sources.list
- change with menu System->Administration->Software sources
Or get a new key (2) Identify the missing ones
sudo apt-get update sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com XXXXXXXXXX
- XXXXXXXXX is the missing key.
4.4 Major upgrades
- You can upgrade from LTS to LTS (however that takes a little bit of waiting, e.g. 12.04 LTS will upgrade to 14.04.01
- Upgrade first the existing installation
- Clean repository information. I.e. remove those that don't work anymore (read this (command-line) or that (details, search for "removing").
4.5 PHP/MySQL trouble with a 10.04 to 12.04 upgrade
- Read this and similar. It helped. I had to force remove remove everything mysql before I could install a 5.5 version + all the other things that were remove (like php-mysql).
- PHP can't find some extensions. Install these again, e.g.
apt-get install php5-gd php5-mcrypt php5-suhosin
5 Networking, file systems and users
5.1 Defining a fixed IP number
By default, a workstation will use numbers from DHCP and that should work without problems.
Alternatively, you also can, in some institutions, that DHCP always provides you with a fixed address. Ask. This solution works in our institution.
Finally, if you want to add manually a or several fixed IP numbers.
- Get one from your computer services
- Read Network Configuration
More simply, on a workstation, use the "Network" tool in the
System settings. Click on Options, then the various tabs ...
5.2 Mounting external NFS partitions
Read more about this topic:
- Setting Up NFS How To (Ubuntu Community Help Wiki)
- Introduction to Fstab (Ubuntu Community Help Wiki)
- Installing mnt and mount points
It's a bad idea to keep your files on your personal PC. Since we have sun servers with daily backup I just mount partitions via NFS. NFS may not be included in your install
apt-get install nfs-common
then edit /etc/fstab and enter line(s) like this
XXX.unige.ch:/export/home /mnt/YYY nfs defaults 0 0
Then mount these
Changing your user id to make it compatible with the one that sits on the server
- If you installed from the standard distribution, your user is is not compatible with the one you have on an other machine, so you have to change it. You can use the user management tool in the System menu (click on "unlock").
- Create a new group first and use the gid from your server (type id- a on the server machine)
- To change your user id is more tricky, can't do this while you are in the desktop. An easy method is to use the usermod tool (after logging out from the GUI !!), e.g.to change user dks to uid=6000
usermod -u 6001 dks
or if you want to change the uid too:
usermod -g 6000 -u 6001 dks
If the mount -a doesn't work there could be a firewall problem. You will have to open NFS communication channels. On the server machine, check the 2049 port.
grep nfs /etc/services
... might tell you what ports nfs needs, e.g.
nfs 2049/tcp # Network File System nfs 2049/udp # Network File System
Now check if these ports are open
sudo ufw status
Change if necessary (see below how to)
5.3 Exporting partitions with NFS
Become root, or add "sudo" in front of all commands ...
Either NFS or Samba allow to share a partition with other (client) machines. In order to use NFS:
1) Install NFS on your server machine
apt-get install nfs-kernel-server
2) Configure the directories to be exported by adding them to the /etc/exports file. For example:
will export the directory /export/data/ for the host (computer) mymachine.yourorg.org with (with-permissions). Do not use something like:
I.e. only give specific machines access to your partition and do not let your client machine be root.
2b) If your client machine (e.g. a personal Linux computer) is not in the DNS, then you can either provide an Internet number or define your machine in the /etc/hosts file, e.g.
Then in the /etc/exports use something like
/data mymachine(rw,sync,no_subtree_check) mylaptop(rw,sync,no_subtree_check)
After doing so, type in the shell
3) Mount the exported directory on your client machines, as already explained above. Firstly make sure that nfs-common is installed.
apt-get install nfs-common
- Create an empty directory, e.g.
- Edit file /etc/fstab on your client machine
servermachine.x.y:/export/data /mnt/data nfs defaults 0 0
- Then type on your client machine:
mount -a (on your machine)
If it doesn't work, look at the log files of the server machine. Most likely you failed to give permission. Also, you should restart the NFS daemon on the server. Type:
4) User id and group ids
If you want to write files in the server, then user and group id's must match on both machines....
5.4 Creating groups
To create an ordinary group of users:
groupadd -g GID_number group_name
sudo groupadd -g 1200 toto
5.5 Creating users
- On your desktop machine, you can use the system menus
- Unlock (top right) in the user accounts tool, then click on the +.
- On a server, you can use useradd. Make sure that user and group id's match those of other machines in case you plan to mount partitions (e.g. a web server directory on your desktop).
- useradd -ggroup_name -uNNNNN -m -p XXXXX login_name
- group_name = name of primary group
- NNNNN = uid number, e.g. 160001
- XXXXX = password
- login_name = login + home directory name, e.g. dks
If you want to add the user to other groups, use the -G flag or use usermod. E.g.
- usermod -Gadmin,adm dks
- will add the user dks to the adm and the admin group.
A simpler way to make someone admin, is to use the GUI (User Accounts tool in the System tools)
- id -a [login]
- will display an id of a user
5.6 Using Samba
5.7 SFTP demon
sudo apt-get install openssh-server
Read: OpenSSH server
5.8 Copying files from the old machine
An easy way to copy files is to use the scp command which is installed by default.
- Exemple - copy recursively a directory from old remote host to the current directory in new (local) machine. On your new, local machine, type something like:
cd ~/some scp -r firstname.lastname@example.org:/home/user/some/source_dir/ .
The rsync program allows to synchronize files between two machines and also can be used to copy and can be recommended to distracted people...
Make sure to include either a trailing slash in the destination folder or go there !
dry-run does what it implies and you should use it first.
- Copy to remote (dry run)
sudo rsync --dry-run -azvv -e ssh /home/path/folder2/ email@example.com:/home/path/folder2
- Get a directory from remote
cd target rsync -avzh firstname.lastname@example.org:/home/user/source_dir .
- Synchronise Music from remote without displaying (wait for a few minutes or hours)
cd rsync -azh email@example.com:/home/schneide/Music .
Via Tar and ssh
- Using tar archives is probably the fastest way, e.g. from the old machine do something like:
(cd /home/path && tar czf - . ) | ssh firstname.lastname@example.org 'cd /home/path && tar xzf -'
Most Linux distribution's installer (at least the free ones) can't handle some slightly more fancy hardware automatically
Usually you have to do either of two things
- Configure the drivers from the ubuntu desktop (if your are lucky) and then use nvidia-settings
- Hand edit the /etc/X11/xorg.conf file to tweak things.
- How to install Nvidia 295.40 drivers in ubuntu 12.04/11.10 using PPA
- Ubuntu Twinview Monitors with an NVidia Graphics Card (T. Fitzgerald/3/2007)
- Remember to save every version (preferably on an other machine or in a wiki) that worked.
6.2 High resolution monitors for Ubuntu 16.x and sound
- a DELL Precision T5810 with a Xeon E5-1620
- a Quadro M4000 graphics card with two monitors
- a DELL UP3216Q 32 (3840 X 2160) at 60Hz
- a DELL U2715H 27 (1440 X 2560), i.e. rotated vertically, at 59.95 Hz
The card has four DisplayPort (DP) slots and the (combined) X Screen 0 has 5280x2560 pixels (1397x677 millimeters)
Connecting a high resolution (as of 2017, i.e. 4K) and a half-hight resolution monitor does work. Main trouble when connecting the monitor was that I did not push in the DP connector enough on display side and the system would not detect the monitor. Only after switching the cable I figured it out. Also when you close the "door" at the back of the screen, the DP can become loose again...
Using DP seems to affect sound output, i.e. after connecting a DP monitor sound will be gone ...
- Either install
pavucontroland use Line Out built-in Audio (the normal Sound controls will not detect this)
- Or connect the loudspeakers directly to the monitor. In that case they will be detected as HDMI/Display Output in both. The normal "Sound" settings also will see the speaker now (HDMI/DisplayPort/GM204 High Definition Audio Controller). That is the solution I adopted.
6.3 Installation of Nvidia Drivers
Firstly, you should know what drivers you have got. In a terminal, type:
The should you see something like the following, i.e. driver version and card model.
Fri Apr 28 18:02:59 2017 +-----------------------------------------------------------------------------+ | NVIDIA-SMI 381.09 Driver Version: 381.09 | |-------------------------------+----------------------+----------------------+ | GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC | | Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. | |===============================+======================+======================| | 0 Quadro M4000 Off | 0000:03:00.0 On | N/A | | 46% 38C P8 13W / 120W | 179MiB / 8111MiB | 0% Default | +-------------------------------+----------------------+----------------------+
If you don't see anything, then there is no driver installed (or you may not have an Nvidia card).
To install or replace a drive, make sure that your machine allows installiong 3rd party drivers.
If you cannot see or use the desktop:
CTRL-ALT F1: To get a terminal
Get rid of old nvidia drivers
sudo apt-get purge nvidia-*
Install the repository (if not already done so)
sudo add-apt-repository ppa:graphics-drivers/ppa sudo apt-get update.
Figure out the name of the latest driver. There are several strategies:
sudo ubuntu-drivers devices
Install the latest driver
# sudo apt-get install nvidia-370 // Make sure to take the best driver you need. Best can be the latest, but not necessarily so... sudo apt install nvidia-381
6.4 Adjust to high resolution screen
Setting default fonts of all application is difficult in Ubuntu. You may have to change several settings using several tools. After an upgrade, settings may revert (so keep a note of what you did). Read more here (Adapt Ubuntu to a high-DPI resolution screen)
You easly can tune the size of menu bars. In the system settings go "Displays" and set the "Scale for menu and title bars", e.g. to 1.38 for a 3840x2160 32 screen and 1.2 for a 2560x1140 27
Fixing menu bars will not fix application fonts. You could change "universal access" fonts, but the applications that do respect this (e.g. terminal, thunderbird, ryhthmbox already do adjust font pixels. If you want to try nevertheless, type:
- Seeing --> Large Text; Slide to On
layout.css.devPixelsPerPxto a value between 1.2 and 1.5 (I use 1.3 but I got good glasses)
- Fonts are fine on the main screen but too big on the small 27 monitor that has a lower resolution
- Best solution: Install font-size-changer plugin
- Older Java applications are definitely the worst UI experience you can get. Not only you will have to cope with strange panel controls but also you won't be able to read anything. You can try Fix scaling of java-based applications for a high DPI screen who propose a python or a bash script to change resolution.
6.5 Lock Screen
You could set "turn off" and "sceen lock" through the standard GUI tool "Brightness and Lock". However, the max. amount you can input is 60 minutes for both.
to change in terminal to blacken after 1 hour and to lock after 2 hours:
gsettings set org.gnome.desktop.session idle-delay 3600 gsettings set org.gnome.desktop.screensaver lock-delay 7200
Check the settings:
gsettings get org.gnome.desktop.screensaver lock-delay gsettings get org.gnome.desktop.screensaver idle-delay
Cannot not see the desktop
You could try to deinstalling the current driver and replace by a new one. See above.
As of April 2017, you will get strange window decorations, fuzzy around the edges. Workaround: Restart the window manager
Solution (maybe). Download the latest driver (see above)
sudo apt install nvidia-381
This will ask again to confirm that secure boot is disabled
... and answer the funny questions
sudo apt-get autoremove
System cannot wakeup after a longer suspend,
- the screen remains black, but you still could open a console using CTL-ALT-F1
- You may see an "entering Power save mode"
- Read this
My personal workaround is simpler:
- Instead of typing my password on the keyboard I only' hit the
SHIFTkey repetitively. After some time (around 10-20 seconds) the screens wake up most often. If instead I type the password, the system will remain blocked and hitting shift wont work...
- If this fails, pressing shortly the on/off button and again pressing down the SHIFT key for a while also may help.
Search System settings, then Displays. Ubuntu should autodetect your monitors. You then can change resolution, rotation and position for each.
For more advanced settings, search CompizConfig in the Dashboard, or type ccsm. You may have to install it and if you have a double monitor configuration, you must install the extras
sudo apt-get install compizconfig-settings-manager compiz-plugins-extra ccsm &
- Click on Window Management
- Tick "Put" (for double monitor)
In addition you could change the hot key for switching.
... Having to install an advanced configuration tool with advanced extras is totally ridiculous. Under Windows adding a second monitor is plug and play. Under Ubuntu this takes 1 hour ore more to figure out.
6.8 Ubuntu Nvidia Quadro FX + 2 digital monitors
Recent Ubuntu editions handle Quadro cards quite well (iff and after you managed to install the system, see above). Just use the display tool in the systems settings.
In case you are interested in older versions of Ubuntu, see the wiki history of this article.
6.9 Displaying remote programs with X11
According to this Stackexchange, If you are root on another machine and you get " X11 connection rejected because of wrong authentication." try the following (worked for me)
ssh remote_host -XY -luser sudo su cd xauth merge /home/user/.Xauthority
7 Sounds / Bell / beep
By default, Ubuntu disables the beep in terminals
To get it back (according to this)
- Run gconf-editor and if the desktop | gnome | peripherals | keyboard | bell_mode setting is present then change it from off to on.
pactl upload-sample /usr/share/sounds/gnome/default/alerts/glass.ogg bell.oggto the file ~/.xprofile
[ "$DISPLAY" ] && xset b 100to the file ~/.bashrc
To get a bell in Emacs, read AlarmBell
By default the window control buttons are to the left in Ubuntu 10.04 LTS - the Lucid Lynx - released in April 2010 (annoying for older people like me who don't want to retrain procedures for no good reason).
To fix this, i.e. move the control buttons to the right as before: Press ALT-F2 or open a terminal and type gconf-editor. Navigate to /apps/metacity/general and change the button_layout to :minimize,maximize,close (the : must be in front).
Of course, you also could specify :maximize,minimize,close ....
9 Hot keys for the brave
So your GUI is stuck ....
To open a console terminal (no GUI):
CTRL-ALT F1 ... same for F2 to F6 (so you can have 6 different terminals)
Then you can for instance restart the Window manager:
sudo restart lightdm
To go back to the desktop:
To see boot system messages
To restart the X server (your GUI)
Basically, an end-user can do most of this stuff with a GUI tool, i.e. the synaptic package administrator. However it is good to know a few command line things for 2 reasons:
- You may have damaged your desktop when trying to install a new video driver
- It's sometimes faster. In particular when you see on some website that this and this package should be installed in this and that order ...
A list of command-line stuff (you must be root or add "sudo" in front of each). Sometimes there are equivalent commands for abt-get and aptitude. See the apt howto at Debian.
10.1 Installing packages from a package archive
- To fix the ubuntu archive mirrors
(if you can, you can also do this from the desktop package manager) Edit /etc/apt/sources.list
You should at least have:
deb http://archive.ubuntu.com/ubuntu/ hardy main universe multiverse restricted deb http://archive.ubuntu.com/ubuntu/ hardy-updates main universe multiverse restricted
... but the it's better to use a nearby mirror, e.g. for Switzerland:
deb http://mirror.switch.ch/ftp/mirror/ubuntu/ (... same for the rest ...)
To check if there are any partially installed packages. It will try to complete these installations.
dpkg --configure -a
To find a package XXX
aptitude search XXX
apt-get install XXX
If this fails because of dependency issues, you then can try:
apt-get -f install
- Cleaning and such
To detect and fix dependency problems
aptitude -f install
To remove packages from the local cache
To update the package list
To reinstall a package XXX that seems to be broken
apt-get --reinstall install XXX
To upgrade conservatively
To upgrade with a an message showing packages
apt-get -u upgrade
To upgrade to a new release
apt-get -u dist-upgrade
To really remove package XXXX
apt-get --purge remove XXXX
If a package doesn't want to go (e.g. something went wrong during install, e.g. a decompression error and a crash in the middle of the install) and an installer (or you) wants it go, look for the package in /var/lib/dpkg/status and make it install ok installed Followed by:
apt-get remove --purge XXXX apt-get update apt-get dist-upgrade (or whatever you planned to install)
10.2 Installing deb files
Sometimes, software is distributed as package for download, i.e. a *.deb file
To install it:
dpkg -i XXX.deb
If you run into dependency error messages you'll have to add packages (no problem) or remove packages (avoid !).
Example (for the eXe eLearning authoring system):
dpkg -i python2.5-exe_1.04.0.3532-ubuntu1_i386.deb
Unpacking python2.5-exe (from python2.5-exe_1.04.0.3532-ubuntu1_i386.deb) ... dpkg: dependency problems prevent configuration of python2.5-exe: python2.5-exe depends on python-zopeinterface (>= 3.0.0-6); however: Package python-zopeinterface is not installed. dpkg: error processing python2.5-exe (--install): dependency problems - leaving unconfigured
First thing to do is to try something like:
apt-get install python-zopeinterface
10.3 Information about packages
xxx is the package name or package file (*.deb) name
- Getting information about a package
apt-cache search xxx
apt-cache showpkg xxx
apt-cache show xxx
- To find a package on your system, if you know a file name
dpkg -S xxx_file_name
apt-file search filename
- To list all packages and search for a name.
dpkg -l | grep xxx
- To extract a deb file without really installing it
dpkg --unpack xxx.deb
- To list the contents of a package file
dpkg -c xxx.deb
10.4 Holding packages
apt-make hold packagename
However, this doesn't seem to work as expected, i.e. Ubuntu will try to update dependencies of a package that you not want to upgrade. For exemple if your package uses and old Java, it will try to update it, although it is gone from the repository.
Edit file /var/lib/dpkg/status
- Remove unwanted old packages from
10.5 Boot files
List all installed images:
dpkg -l linux-image-\* | grep ^ii
If the following does not work (e.g. because the file partition is full):
sudo apt-get purge linux-image-3.2.0-55
sudo dpkg --purge linux-image-3.2.0-55-generic ... etc.
Then, in order to complete a previous failed installation:
sudo apt-get -f install
Finally, now clean a whole lot of other old ones, eg.
sudo apt-get purge linux-image-3.2.0-58 linux-image-3.2.0-59 linux-image-3.2.0-60 linux-image-3.2.0-61
And remove other stuff you don't need
sudo apt-get autoremove
Printers don't necessarily work automatically either:
Before connecting a network printer, it is likely that you need a a PPD file (a file that defines properties of your postscript printer). Get it from:
11.1 Example Infotec
(this needs to be verified)
Example for Infotec ISC 1032 (A low end color copy and printer machine)
- Look at the entry:
- Get the PPD file (and copy it anywhere) ** http://openprinting.org/foomatic-db/db/source/PPD/Infotec/PS/Infotec-ISC1032_PS.ppd
- Then, start http://localhost:631/admin in your browser and when asked upload the PPD file
- Finally configure the printer (e.g. define paper size, trays and stuff).
- If CUPs printing doesn't work, use "HP JeDirect" and port 9100.
11.2 Different Ubuntu user name ?
Summary (Quoted from above) According to the man page https://www.cups.org/doc/man-client.conf.html, a User directive could be placed in /etc/cups/client.conf or ~/.cups/client.conf
However, this didn't work for me in Kubuntu Trusty. What worked, was to export the CUPS_USER environment variable by adding the following line in ~/.profile:
12 X Windows
We run a few sun servers and I prefer to run emacs (GUI) on a remote machine instead of mounting all these file systems. Also I prefer to have a root terminal open instead of typing 'sudo' all the time. If you want allow for this:
- Reconfigure the window manager (gdm)
- Edit /etc/gdm/gdm.conf and change:
- Then, you'll need to restart your X session (Ctrl + Alt + Backspace)
- Allow remote hosts to connect
- Then you can allow certain hosts to connect e.g. to allow root on your own machine type
xhost + localhost
- To allow somebody on a different machine, type:
xhost + xxx.yyy.zzz
- It's important not to to type 'xhost +'. Since anyone may then connect to your screen. However, type xhost + something is boring, so it's more practical to edit /etc/X0.hosts. Just put the names or IP numbers of authorized machines there.
- If it doesn't work
You can install nmap to scan ports (X is on 6000).
- If you don't have nmap:
sudo apt-get install nmap
- Then type (as user):
nmap -v -A localhost
In some cases you may have to define the display of your machine on your client machine. On your client machine type something like:
setenv DISPLAY xxx.yyy.zzz:0
Or more practical, log into the the client machine like this:
By default Ubuntu comes with some Java compatible version that is free. For some applications though, you need Java 7 or 8 from Oracle (Java formerly was made by Sun)
13.1 Java 8
(tested with Ubuntu 14.x LTS)
sudo add-apt-repository ppa:webupd8team/java sudo apt-get update sudo apt-get install oracle-java8-installer
You should see something like
java version "1.8.0_77" Java(TM) SE Runtime Environment (build 1.8.0_77-b03) Java HotSpot(TM) 64-Bit Server VM (build 25.77-b03, mixed mode)
13.2 Java in Firefox
Installing Java does not install a plugin in Firefox. Java is needed for many institutional applications and in addition there are many interesting applets for education. So let's go. Make sure that Java is installed on your machine (e.g. see above for Oracle Java).
For old Firefox version
The following will not work with a recent Firefox )> 53 I believe)
Install a a Firefox plugin that should enable a currently installed Open Java (did not work for me)
sudo apt-get install icedtea-plugin
Create a symbolic link to the Oracle plugin from the Firefox plugin directory (did not work for me)
cd /usr/lib/firefox-addons/plugins ln -s /usr/lib/jvm/java-8-oracle/jre/lib/amd64/libnpjp2.so
Install the Firefox ESR version (this works)
It seems that the only way to have Java under Linux is to install an old version of Firefox. The "ESR" version was made for just this purpose.
* Download firefox ESR * Unpack the bz file somwhere, e.g. in ~/bin/firefox tar xjvf firefox-52.2.0esr.tar.bz2 mv firefox ~/bin/
Then launch it like so:
~/bin/firefox/firefox --new-instance -P ESR
- this is important I believe. You should not mess with your default profile that you use with your regular new version of firefox. This version is just for messing with Java applets.
Sound may not work either.
- Install all the ALSA stuff (e.g. via the synaptic package manager)
- Then test with Menu System->Preferences-Sound
- Then set the right default volume with Menu Applications->Sound and Video->ALSA Mixer GUID (in particular PCM ! It may be as simple as that ...)
14.1 Sound trouble ?
If sound doesn't work search the Ubuntu forums: http://ubuntuforums.org/. A particular good overview posting was:
To list you sound hardware, type:
If there are none, type:
... and search through the list until you find something like:
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
This means that you do have a sound card, but that the drivers or something else is missing....
Anyhow it may take some time (between a few minutes and a few days) to find a solution. Often, the only thing you'd have to do is to add a line to /etc/modprobe.d/alsa-base (needs root permissions). I have for my DELL/Sigmatel:
options snd-hda-intel model=ref
Then, reboot !
Note: To list all drivers on your machine, type:
If I understand right, drivers are kernel modules.
14.2 Give permission to insecure web sites
Nearly no Java Web site will run once you enabled Java.
Give these sites permission (of course, only do that with your local administration or non-local friendly educational applications...)
- Security tab.
15 Application hints
To edit a playlist (i.e. reorder items), there are two options
- You can drag items up and down (untick "browse" in the View menu, if you need more space)
- You can edit the XML (better for very large lists, maybe do a save before you do this)
Also, it's a good idea to remember that you can copy this file, if you decide to re-install your machine and start with a clean/new setup
15.2 Who else has Linux nearby ?
sudo nmap -O xxx.yyy.zzz.1-255 | grep "Running: " | sort | uniq -c
16 Non-standard software
Some organization maintain their own Debian/Ubuntu package servers.
Shotcut is a cross platform free video editor which has good rankings (also on Windows). Tested on oct. 2017 with Ubuntu 16x.
There are different ways to install it. I chose a PPA distribution that seems to be trustworthy. I also had to add a missing library after installing.
sudo add-apt-repository ppa:haraldhv/shotcut sudo apt-get update sudo apt install shotcut
First time, launch it in the terminal so you can spot errors if there are.
Install this one before if you do not have it.
sudo apt-get install libsdl2-2.0
Mendeley, the bibliography and article manager does have a Debian distribution.
- Click on the download link
- Install from the package manager that should open
Also, install the libre office and web browser plugins if not already done so.
E.g. to install Skype, you could
- Add the Skype repository like this in the Synaptic Package Manager (through settings->Repositories->Third-Party Software)
deb http://download.skype.com/linux/repos/debian/ stable non-free
- Reload or update the package information and search for "skype"
- Install the skype package.
16.4 Google Chrome
Read How to install Google Chrome (askubuntu)
wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add - sudo sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list' sudo apt-get update sudo apt-get install google-chrome-stable
- SSH Keys
- Generating New, More Secure SSH Keys by Pat Regan
- Improving the security of your SSH private key files by Martin Kleppmann
sudo ufw status sudo ufw --help
To allow port 7777 for tcp for everyone:
sudo ufw allow 7777/tcp
To allow port 2049 for TCP and UDP for a given IP (replace your_ip_number with your IP number)
sudo ufw allow from your_ip_number to any port 2049 proto tcp sudo ufw allow from your_ip_number to any port 2049 proto udp
To allow everything from a given IP
sudo ufw allow from ip_number_here
After that, reload the firewall:
sudo ufw reload
To disable / enable
sudo ufw disable
- E.g. for testing purposes ....
sudo ufw enable
18 Opinions and alternatives
Add yours ...
- Daniel K. Schneider uses Ubuntu since March 2007, because he got fed up with Mandriva updates not working correctly. I hate all OS's (Unix, Mac, Win) but prefer to work on Unix because it's fairly stable and appropriate for what I do. I also do have Windows machines for doing stuff that needs Win 7. (E.g. Flash, word processing with Framemaker, X3D, Games). Our servers (e.g. for this wiki) run mostly under Ubuntu too. Before we ran Solaris which is much more difficult to install and maintain but extra solid.
- Indeed (it's now August 2007 and I went through a major upgrade) I find that Ubuntu and its packaging system is far more robust. Though I once failed with a non supported package, i.e. Cinelerra that I got from another site. It installed, but crashed on start. Have to try again at some point.
- If your applications crash (e.g. Firefox) check your bloody RAM. It may be defective and you can loose 3 days of work trying to reinstall when there is absolutely no need. Ubuntu is solid, even if the installation can be messy !
- I don't like the new 12.04 Desktop. Not very efficient for people who know what they are doing (see the installation notes on top)
- Linux Mint, can be described as some kind of easier to use Ubuntu. There is also a Linux Mint Debian Edition that is directly based on Debian and it may be of interest to people who want to be closer to Debian. Both editions should behave in the same way. Read the Wikipedia article and Linux Mint 15 A better Ubuntu for the desktop (May 2013).
- If you dislike Unity (the standard Ubuntu 12x desktop) you also could just user another one, e.g. Cinnamon. Read how to Install latest Cinnamon 1.6.4 in Ubuntu 12.10/12.04/Linux Mint
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable sudo apt-get update sudo apt-get install cinnamon
Then, log out and you will have the option to use Cinnamon. The normal Ubuntu Desktop will remain there and you can therefore switch back easily....
(there are many others)