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The packaging system uses a private database to keep track of which packages
are installed, which are not installed and which are available for
installation. The apt-get program uses this database to find out
how to install packages requested by the user and to find out which additional
packages are needed in order for a selected package to work properly.
To update this list, you would use the command apt-get update.
This command looks for the package lists in the archives found in
/etc/apt/sources.list; see The /etc/apt/sources.list file, Section
2.1 for more information about this file.
It's a good idea to run this command regularly to keep yourself and your system informed about possible package updates, particularly security updates.
Finally, the process you've all been waiting for! With your sources.list ready and your list of available packages up to date, all you have to do is run apt-get to get your desired package installed. For example, you can run:
# apt-get install xchat
APT will search it's database for the most recent version of this package and will retrieve it from the corresponding archive as specified in sources.list. In the event that this package depends on another -- as is the case here -- APT will check the dependencies and install the needed packages. See this example:
# apt-get install nautilus
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
bonobo libmedusa0 libnautilus0
The following NEW packages will be installed:
bonobo libmedusa0 libnautilus0 nautilus
0 packages upgraded, 4 newly installed, 0 to remove and 1 not upgraded.
Need to get 8329kB of archives. After unpacking 17.2MB will be used.
Do you want to continue? [Y/n]
The package nautilus depends on the shared libraries cited,
therefore APT will get them from the archive. If you had specified the names
of these libraries on the apt-get command line, APT would not have
asked if you wanted to continue; it would automatically accept that you wanted
to install all of those packages.
This means that APT only asks for confirmation when it needs to install packages which weren't specified on the command line.
The following options to apt-get may be useful:
-h This help text.
-d Download only - do NOT install or unpack archives
-f Attempt to continue if the integrity check fails
-s No-act. Perform ordering simulation
-y Assume Yes to all queries and do not prompt
-u Show a list of upgraded packages as well
Multiple packages may be selected for installation in one line. Files downloaded from the network are placed in the directory /var/cache/apt/archives for later installation.
You can specify packages to be removed on the same command line, as well. Just put a '-' immediately after the name of the package to be removed, like this:
# apt-get install nautilus gnome-panel-
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
bonobo libmedusa0 libnautilus0
The following packages will be REMOVED:
gnome-applets gnome-panel gnome-panel-data gnome-session
The following NEW packages will be installed:
bonobo libmedusa0 libnautilus0 nautilus
0 packages upgraded, 4 newly installed, 4 to remove and 1 not upgraded.
Need to get 8329kB of archives. After unpacking 2594kB will be used.
Do you want to continue? [Y/n]
See section Removing packages, Section 3.3 for more details on package removal.
If you somehow damage an installed package, or simply want the files of a package to be reinstalled with the newest version that is available, you can use the --reinstall option like so:
# apt-get --reinstall install gdm
Reading Package Lists... Done
Building Dependency Tree... Done
0 packages upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 1 not upgraded.
Need to get 0B/182kB of archives. After unpacking 0B will be used.
Do you want to continue? [Y/n]
If you no longer want to use a package, you can remove it from your system using APT. To do this just type: apt-get remove package. For example:
# apt-get remove gnome-panel
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be REMOVED:
gnome-applets gnome-panel gnome-panel-data gnome-session
0 packages upgraded, 0 newly installed, 4 to remove and 1 not upgraded.
Need to get 0B of archives. After unpacking 14.6MB will be freed.
Do you want to continue? [Y/n]
As you can see in the above example, APT also takes care of removing packages which depend on the package you have asked to remove. There is no way to remove a package using APT without also removing those packages that depend on it.
Running apt-get as above will cause the packages to be removed but
their configuration files, if any, will remain intact on the system. For a
complete removal of the package, run:
# apt-get --purge remove gnome-panel
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be REMOVED:
gnome-applets* gnome-panel* gnome-panel-data* gnome-session*
0 packages upgraded, 0 newly installed, 4 to remove and 1 not upgraded.
Need to get 0B of archives. After unpacking 14.6MB will be freed.
Do you want to continue? [Y/n]
Note the '*' after the names. This indicates that the configuration files for each of these packages will also be removed.
Just as in the case of the install method, you can use a symbol with remove to invert the meaning for a particular package. In the case of removing, if you add a '+' right after the package name, the package will be installed instead of being removed.
# apt-get --purge remove gnome-panel nautilus+
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
bonobo libmedusa0 libnautilus0 nautilus
The following packages will be REMOVED:
gnome-applets* gnome-panel* gnome-panel-data* gnome-session*
The following NEW packages will be installed:
bonobo libmedusa0 libnautilus0 nautilus
0 packages upgraded, 4 newly installed, 4 to remove and 1 not upgraded.
Need to get 8329kB of archives. After unpacking 2594kB will be used.
Do you want to continue? [Y/n]
Note that apt-get lists the extra packages which will be installed
(that is, the packages whose installation is needed for the proper functioning
of the package whose installation has been requested), those which will be
removed, and those which will be installed (including the extra packages
again).
Package upgrades are a great success of the APT system. They can be achieved with a single command: apt-get upgrade. You can use this command to upgrade packages within the same distribution, as well as to upgrade to a new distribution, although for the latter the command apt-get dist-upgrade is preferred; see section Upgrading to a new release, Section 3.5 for more details.
It's useful to run this command with the -u option. This option causes APT to show the complete list of packages which will be upgraded. Without it, you'll be upgrading blindly. APT will download the latest versions of each package and will install them in the proper order. It's important to always run apt-get update before you try this. See section Updating the list of available packages, Section 3.1. Look at this example:
# apt-get -u upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages have been kept back
cpp gcc lilo
The following packages will be upgraded
adduser ae apt autoconf debhelper dpkg-dev esound esound-common ftp indent
ipchains isapnptools libaudiofile-dev libaudiofile0 libesd0 libesd0-dev
libgtk1.2 libgtk1.2-dev liblockfile1 libnewt0 liborbit-dev liborbit0
libstdc++2.10-glibc2.2 libtiff3g libtiff3g-dev modconf orbit procps psmisc
29 packages upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
Need to get 5055B/5055kB of archives. After unpacking 1161kB will be used.
Do you want to continue? [Y/n]
The process is very simple. Note that in the first few lines, apt-get says that some packages were kept back. This means that there are new versions of these packages which will not be installed for some reason. Possible reasons are broken dependencies (a package on which it depends doesn't have a version available for download) or new dependencies (the package has come to depend on new packages since the last version).
There's no clean solution for this first case. For the second case, it's sufficient to run apt-get install for the specific package in question, as this will download the dependencies. An even cleaner solution is to use dist-upgrade. See section Upgrading to a new release, Section 3.5.
This feature of APT allows you to upgrade an entire Debian system at once, either through the Internet or from a new CD (purchased or downloaded as an ISO image).
It is also used when changes are made to the relationships between installed packages. With apt-get upgrade, these packages would be kept untouched (kept back).
For example, suppose that you're using revision 0 of the stable version of
Debian and you buy a CD with revision 3. You can use APT to upgrade your
system from this new CD. To do this, use apt-cdrom (see section
Adding a CD-ROM to the sources.list file,
Section 2.4) to add the CD to your /etc/apt/sources.list and
run apt-get dist-upgrade.
It's important to note that APT always looks for the most recent versions of packages. Therefore, if your /etc/apt/sources.list were to list an archive that had a more recent version of a package than the version on the CD, APT would download the package from there.
In the example shown in section Upgrading packages, Section 3.4, we saw that some packages were kept back. We'll solve this problem now with the dist-upgrade method:
# apt-get -u dist-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
The following NEW packages will be installed:
cpp-2.95 cron exim gcc-2.95 libident libopenldap-runtime libopenldap1
libpcre2 logrotate mailx
The following packages have been kept back
lilo
The following packages will be upgraded
adduser ae apt autoconf cpp debhelper dpkg-dev esound esound-common ftp gcc
indent ipchains isapnptools libaudiofile-dev libaudiofile0 libesd0
libesd0-dev libgtk1.2 libgtk1.2-dev liblockfile1 libnewt0 liborbit-dev
liborbit0 libstdc++2.10-glibc2.2 libtiff3g libtiff3g-dev modconf orbit
procps psmisc
31 packages upgraded, 10 newly installed, 0 to remove and 1 not upgraded.
Need to get 0B/7098kB of archives. After unpacking 3118kB will be used.
Do you want to continue? [Y/n]
Note now that the packages will be upgraded, and new packages will also be installed (the new dependencies of the packages). Note too that lilo is still being kept back. It probably has a more serious problem than a new dependency. We can find out by running:
# apt-get -u install lilo
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
cron debconf exim libident libopenldap-runtime libopenldap1 libpcre2
logrotate mailx
The following packages will be REMOVED:
debconf-tiny
The following NEW packages will be installed:
cron debconf exim libident libopenldap-runtime libopenldap1 libpcre2
logrotate mailx
The following packages will be upgraded
lilo
1 packages upgraded, 9 newly installed, 1 to remove and 31 not upgraded.
Need to get 225kB/1179kB of archives. After unpacking 2659kB will be used.
Do you want to continue? [Y/n]
As noted in the above, lilo has a new conflict with the package
debconf-tiny, which means it couldn't be installed (or upgraded)
without removing debconf-tiny.
To know what's keeping or removing a package you may use:
# apt-get -o Debug::pkgProblemResolver=yes dist-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Starting
Starting 2
Investigating python1.5
Package python1.5 has broken dep on python1.5-base
Considering python1.5-base 0 as a solution to python1.5 0
Holding Back python1.5 rather than change python1.5-base
Investigating python1.5-dev
Package python1.5-dev has broken dep on python1.5
Considering python1.5 0 as a solution to python1.5-dev 0
Holding Back python1.5-dev rather than change python1.5
Try to Re-Instate python1.5-dev
Done
Done
The following packages have been kept back
gs python1.5-dev
0 packages upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
This way, it's easy to notice that the python1.5-dev package cannot be installed because of an unsatisfied dependency: python1.5.
When you install a package APT retrieves the needed files from the hosts listed
in /etc/apt/sources.list, stores them in a local repository
(/var/cache/apt/archives/), and then proceeds with installation,
see Installing packages, Section 3.2.
In time the local repository can grow and occupy a lot of disk space.
Fortunately, APT provides tools for managing its local repository:
apt-get's clean and autoclean methods.
apt-get clean removes everything except lock files from
/var/cache/apt/archives/ and
/var/cache/apt/archives/partial/. Thus, if you need to reinstall
a package APT should retrieve it again.
apt-get autoclean removes only package files that can no longer be
downloaded.
The following example show how apt-get autoclean works:
# ls /var/cache/apt/archives/logrotate* /var/cache/apt/archives/gpm*
logrotate_3.5.9-7_i386.deb
logrotate_3.5.9-8_i386.deb
gpm_1.19.6-11_i386.deb
In /var/cache/apt/archives there are two files for the package
logrotate and one for the package gpm.
# apt-show-versions -p logrotate
logrotate/stable uptodate 3.5.9-8
# apt-show-versions -p gpm
gpm/stable upgradeable from 1.19.6-11 to 1.19.6-12
apt-show-versions shows that
logrotate_3.5.9-8_i386.deb provides the up to date version of
logrotate, so logrotate_3.5.9-7_i386.deb is useless.
Also gpm_1.19.6-11_i386.deb is useless because a more recent
version of the package can be retrieved.
# apt-get autoclean
Reading Package Lists... Done
Building Dependency Tree... Done
Del gpm 1.19.6-11 [145kB]
Del logrotate 3.5.9-7 [26.5kB]
Finally, apt-get autoclean removes only the old files. See How to upgrade packages from specific versions of Debian, Section 3.9 for more information on apt-show-versions.
dselect is a program that helps users select Debian packages for
installation. It's considered somewhat complicated and rather boring, but with
practice you can get the hang of its console-based ncurses interface.
One feature of dselect is that it knows how to make use of the capacity Debian packages have for "recommending" and "suggesting" other packages for installation. To use the program, run `dselect' as root. Choose 'apt' as your access method. This isn't truly necessary, but if you're not using a CD ROM and you want to download packages from the Internet, it's the best way to use dselect.
To gain a better understanding of dselect's usage, read the dselect
documentation found on the Debian page http://www.debian.org/doc/ddp.
After making your selections with dselect, use:
# apt-get -u dselect-upgrade
as in the example below:
# apt-get -u dselect-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
The following packages will be REMOVED:
lbxproxy
The following NEW packages will be installed:
bonobo console-tools-libs cpp-3.0 enscript expat fingerd gcc-3.0
gcc-3.0-base icepref klogd libdigest-md5-perl libfnlib0 libft-perl
libgc5-dev libgcc300 libhtml-clean-perl libltdl0-dev libsasl-modules
libstdc++3.0 metamail nethack proftpd-doc psfontmgr python-newt talk tidy
util-linux-locales vacation xbill xplanet-images
The following packages will be upgraded
debian-policy
1 packages upgraded, 30 newly installed, 1 to remove and 0 not upgraded.
Need to get 7140kB of archives. After unpacking 16.3MB will be used.
Do you want to continue? [Y/n]
Compare with what we see when running apt-get dist-upgrade on the same system:
# apt-get -u dist-upgrade
Reading Package Lists... Done
Building Dependency Tree... Done
Calculating Upgrade... Done
The following packages will be upgraded
debian-policy
1 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 421kB of archives. After unpacking 25.6kB will be freed.
Do you want to continue? [Y/n]
Note that many of the packages from above are being installed because other packages "suggested" or "recommended" them. Others are being installed or removed (in the case of lbxproxy, for example) per the choices we made while navigating through dselect's package listing. Dselect can be a powerful tool when used in conjunction with APT.
People are sometimes interested in using one of the Debian versions as its main system distribution and one or more packages from another branch.
To set up what is your main version of Debian you should edit the
/etc/apt/apt.conf (it does not usually exist, create it if you
don't have one) to contain the following line:
APT::Default-Release "version";
Where version is the version of Debian you want to use as the main distribution. The versions you can use are stable, testing and unstable. To install packages from another version, then, you must use APT in the following way:
# apt-get -t distribution install package
For that to work, though, you need at least one APT source line in your
/etc/apt/sources.list for the distribution you want the package
from, and the package must exist on that source.
You can also request a specific version of a package using the following sintax:
# apt-get install package=version
For example, the line below will install version 2.2.4-1 of the
nautilus package.:
# apt-get install nautilus=2.2.4-1
IMPORTANT: the `unstable' version of Debian is the version to which the newest versions of Debian packages are uploaded first. This distribution sees all of the changes that packages go through, both small ones and more drastic ones which affect many packages or the whole system. For this reason, this version of the distribution should not be used by inexperienced users or by those who need proven stability.
The `testing' distribution is not necessarily better than `unstable', because it does not receive security updates quickly. For servers and other production systems stable should always be used.
apt-show-versions provides a safe way for users of mixed
distributions to upgrade their systems without getting more of the less-stable
distribution than they had in mind. For instance, it is possible to upgrade
just your unstable packages by running after having installed the
apt-show-versions package:
# apt-get install `apt-show-versions -u -b | grep unstable | cut -d ' ' -f 1`
You may have occasion to modify something in a package and don't have time or don't want to port those changes to a new version of the program. Or, for instance, you may have just upgraded your Debian distribution to 3.0, but want to continue with the version of a certain package from Debian 2.2. You can "pin" the version you have installed so that it will not be upgraded.
Using this resource is simple. You just need to edit the file /etc/apt/preferences.
The format is simple:
Package: <package>
Pin: <pin definition>
Pin-Priority: <pin's priority>
Each entry must be separated from any other entries by a blank line. For
example, to keep package sylpheed that I have modified to use
"reply-to-list" at version 0.4.99, I add:
Package: sylpheed
Pin: version 0.4.99*
Note that I used an * (asterisk). This is a "wildcard"; it say that I want that this "pin" to be valid for all versions beginning with 0.4.99. This is because Debian versions its packages with a "Debian revision" and I don't want to avoid the installation of these revisions. So, for instance, versions 0.4.99-1 and 0.4.99-10 will be installed as soon as they are made available. Note that if you modified the package you won't want to do things this way.
The pin priority helps determine whether a package matching the
"Packages:" and "Pin:" lines will be installed, with higher
priorities making it more likely that a matching package will be installed.
You can read apt_preferences(7) for a thorough discussion of
priorities, but a few examples should give the basic idea. The following
describes the effect of setting the priority field to different values in the
sylpheed example above.
Sylpheed version 0.4.99 will never be replaced by apt. If available, apt will install version 0.4.99 even if it would replace an installed package with a higher version. Only packages of priority greater than 1000 will ever downgrade an existing package.
The effect is the same as priority 1001, except that apt will refuse to downgrade an installed version to 0.4.99
Version 0.4.99 will be replaced only by a higher version available from a release designated as preferred using the "APT::Default-Release" variable (see How to keep a mixed system, Section 3.8, above).
Any version higher than 0.4.99 of sylpheed which is available from any release will take preference over version 0.4.99, but 0.4.99 will still be preferred to a lower version.
Higher versions of sylpheed available from any release will take preference over version 0.4.99, as will any installed higher version of slypheed; so 0.4.99 will be installed only if no version is installed already. This is the priority of installed packages.
Negative priorities are allowed as well, and prevent 0.4.99 from ever being installed.
A pin can be specified on a package's version, release or origin.
Pinning on a version, as we have seen, supports literal version numbers as well as wildcards to specify several versions at one time.
Option release depends on the Release file from an APT repository or from a CD. This option may be of no use at all if you're using package repositories that don't provide this file. You may see the contents of the Release files that you have on /var/lib/apt/lists/. The parameters for a release are: a (archive), c (components), v (version), o (origin) and l (label).
An example:
Package: *
Pin: release v=2.2*,a=stable,c=main,o=Debian,l=Debian
Pin-Priority: 1001
In this example, we chose version 2.2* of Debian (which can be 2.2r2, 2.2r3 -- this accommodates "point releases" that typically include security fixes and other very important updates), the stable repository, section main (as opposed to contrib or non-free) and origin and label Debian. Origin (o=) defines who produced that Release file, the label (l=) defines the name of the distribution: Debian for Debian itself and Progeny for Progeny, for example. A sample Release file:
$ cat /var/lib/apt/lists/ftp.debian.org.br_debian_dists_potato_main_binary-i386_Release
Archive: stable
Version: 2.2r3
Component: main
Origin: Debian
Label: Debian
Architecture: i386
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APT HOWTO (Obsolete Documentation)
1.8.11 - August 2005kov@debian.org