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ADMIN Package Management with apt in Debian

Crunchbang's recent releases are based on Debian. Every application or component comes as a package and is then installed on your system.

The application set which installs the packages on your system is called APT (Advanced Package Tool). It consists of different tools which are briefly introduced on this page.

apt-get

System Updates and Upgrades

Packages are saved on a server and downloaded by the administrator. To synchronize the local database with the database on the server, use:

sudo apt-get update

If package versions have changed between the synchronization intervals, you can bring the locally installed packages up-to-date with:

sudo apt-get dist-upgrade

Package Installation and Removal

To install a package from the repositories, use:

sudo apt-get install PACKAGENAME

To remove packages without their corresponding configuration files:

sudo apt-get remove PACKAGENAME

You can remove a package including their configuration files completely using:

sudo apt-get purge PACKAGENAME

Local database Maintanance

To clean up the downloaded packages that are no longer available in the repositories:

sudo apt-get autoclean

To remove all packages from the package cache use clean (not recommended if you have a slow network connection):

sudo apt-get clean

To remove packages that were installed by other packages and are no longer needed:

sudo apt-get autoremove

If your dist-upgrade or install of a new package stops unexpectedly, try to fix the installation:

sudo apt-get -f install

Optional: Install apt-listbugs to be informed if packages to be downloaded and installed are reported to have a bug:

sudo apt-get install apt-listbugs

You can check for broken dependencies with the check option:

sudo apt-get check

If you see an error message like

E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

it means you tried to perform operations as normal user - simply put sudo in front of your command.

apt-cache

Debian's repositories contain over 25'000 packages. If you want to install - for example - a lightweight editor like Notepad, and you do not know the package name, you can use apt-cache to search the database.

apt-cache search notepad

will show something like

basket-data - data files for BasKet Notepads
jscribble - graphical notepad for use with a pen tablet
kephra - gui text editor along Perl alike Paradigms
leafpad - GTK+ based simple text editor

You can install the desired application (let's choose leafpad) with the command

apt-get install leafpad

To find out which version of a package is installed or available in the repositories, you can use:

apt-cache policy PACKAGENAME

This is especially helpful if you have a mixed sources.list

sources.list

The file sources.list is found in the location /etc/apt/sources.list and contains the repositories which apt gets the database and installs packages from. Do not change this file if not necessary. Version mismatches can make your system impossible to upgrade. Though not recommended, there are certain applications that are not available in Debians repositories (like Skype) or outdated (like Virtualbox or Wine) may require you to add third-party repositories. If you do so, refer to the corresponding installation guides to prevent problems.

To edit this file you need to be root.

sudo nano /etc/apt/sources.list

Do not mix stable, testing and unstable (Squeeze, Wheezy, Sid) repositories. Backports are acceptable if they have a lower priority in apt's preferences.

dpkg

Another way of installing .deb packages that are not in the repositories is by using dpkg.

sudo dpkg -i /path/to/package.deb

installs the package.deb but does not resolve dependencies. You can use a tool like gdebi to automatically resolve them. Make sure gdebi is installed:

sudo apt-get install gdebi

In your file manager you can now double-click on the downloaded .deb file and open it with gdebi.

A word of warning: externally packaged binaries can lead to problems and make your system go Crunch! BANG!

Removing previously installed .deb packages can be performed using

sudo dpkg -r /path/to/package.deb


Some packages might be buggy and broken in the Debian repositories. If you want to prevent a package from upgrading:

echo "PACKAGENAME hold" | sudo dpkg --set-selections

Release this lock when the package is repaired upstream, using:

echo "PACKAGENAME install" | sudo dpkg --set-selections

Similar to apt-cache search is

dpkg -l *SEARCH_TERM*

It shows you a list of findings (ii stands for installed, un for not installed)

Links and References

 
howto/package_management.txt · Last modified: 2012/06/10 16:59 by pidsley
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