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Advanced Packaging Tool

advanced packaging tool, advanced packaging tool download
The Advanced Package Tool, or APT, is a free software user interface that works with core libraries to handle the installation and removal of software on the Debian, Slackware and other Linux distributions3 APT simplifies the process of managing software on Unix-like computer systems by automating the retrieval, configuration and installation of software packages, either from precompiled files or by compiling source code3

APT was originally designed as a front-end for dpkg to work with Debian's deb packages, but it has since been modified to also work with the RPM Package Manager system via APT-RPM4 The Fink project has ported APT to Mac OS X for some of its own package management tasks,5 and APT is also available in OpenSolaris


  • 1 Usage
    • 11 Installing software
    • 12 apt-get
      • 121 Update, upgrade and dist-upgrade
    • 13 apt-file
  • 2 Configuration and files
    • 21 Files
  • 3 Sources
  • 4 APT pinning
  • 5 Front-ends
  • 6 History
  • 7 See also
  • 8 References
  • 9 External links


There has been an apt program since version 10; apt is a collection of tools distributed in a package named apt A significant part of apt is defined in a C++ library of functions; apt also includes command-line programs for dealing with packages, which use the library Three such programs are apt, apt-get and apt-cache They are commonly used in examples of apt because they are simple and ubiquitous The apt package is of "important" priority in all current Debian releases, and is therefore installed in a default Debian installation Apt can be considered a front-end to dpkg, friendlier than the older dselect front-end While dpkg performs actions on individual packages, apt tools manage relations especially dependencies between them, as well as sourcing and management of higher-level versioning decisions release tracking and version pinning

APT is often hailed as one of Debian's best features,6789 which Debian developers attribute to the strict quality controls in Debian's policy1011

A major feature in APT is the way it calls dpkg — it does topological sorting of the list of packages to be installed or removed and calls dpkg in the best possible sequence In some cases, it utilizes the --force options in dpkg However, it only does this when it is unable to calculate how to avoid the reason dpkg requires the action to be forced

Installing softwareedit

The user indicates one or more packages to be installed Each package name is phrased as just the name portion of the package, not a fully qualified filename for instance, in a Debian system, libc6 would be the argument provided, not libc6_196-2deb Notably, apt automatically gets and installs packages upon which the indicated package depends if necessary This was an original distinguishing characteristic of apt-based package management systems, as it avoided installation failure due to missing dependencies, a type of dependency hell

Another such distinction is remote repository retrieval of packages apt uses location configuration file /etc/apt/sourceslist to locate the desired packages, which might be available on the network or a removable storage medium, for example, and retrieve them, and also obtain information about available but not installed packages

apt provides other command options to override decisions made by apt-get's conflict resolution system One option is to force a particular version of a package This can downgrade a package and render dependent software inoperable, so the user must be careful

Finally, the apt_preferences mechanism allows the user to create an alternative installation policy for individual packages

The user can specify packages by POSIX regular expression


apt-get is the command line package management tool supplied with the Debian package apt APT searches its cached list of packages and lists the dependencies that must be installed or updated

Triggers are the treatment of deferred actions

APT retrieves, configures and installs the dependencies automatically

Update, upgrade and dist-upgradeedit

Other commands used in apt-get:

  • update is used to resynchronize the package index files from their sources The lists of available packages are fetched from the locations specified in /etc/apt/sourceslist For example, when using a Debian archive, this command retrieves and scans the Packagesgz files, so that information about new and updated packages is available
  • upgrade is used to install the newest versions of all packages currently installed on the system from the sources enumerated in /etc/apt/sourceslist Packages currently installed with new versions available are retrieved and upgraded; under no circumstances are currently installed packages removed, or packages not already installed retrieved and installed New versions of currently installed packages that cannot be upgraded without changing the install status of another package will be left at their current version
  • dist-upgrade, in addition to performing the function of upgrade, also intelligently handles changing dependencies with new versions of packages; apt-get has a "smart" conflict resolution system, and it will attempt to upgrade the most important packages at the expense of less important ones if necessary The /etc/apt/sourceslist file contains a list of locations from which to retrieve desired package files12 aptitude has a smarter dist-upgrade feature called full-upgrade13


apt-file is a command to find which package includes a specific file, or to list all files included in a package It is packaged separately from the main APT utilities

Example to find a package:

$ apt-file update # Fetch the files installed by the packages in local cache $ apt-file find vmlinuz # Find all packages providing a filename vmlinuz linux-image-480-17-generic: /boot/vmlinuz-480-17-generic linux-image-480-17-lowlatency: /boot/vmlinuz-480-17-lowlatency linux-image-480-19-generic: /boot/vmlinuz-480-19-generic linux-image-480-19-lowlatency: /boot/vmlinuz-480-19-lowlatency linux-signed-image-480-17-generic: /usr/lib/linux/vmlinuz-480-17-genericefisignature linux-signed-image-480-17-lowlatency: /usr/lib/linux/vmlinuz-480-17-lowlatencyefisignature linux-signed-image-480-19-generic: /usr/lib/linux/vmlinuz-480-19-genericefisignature linux-signed-image-480-19-lowlatency: /usr/lib/linux/vmlinuz-480-19-lowlatencyefisignature ltsp-client-core: /usr/share/ltsp/cleanupd/50-vmlinuz needrestart: /usr/lib/needrestart/vmlinuz-get-version $ apt-file find /boot/vmlinuz-480-17-generic # Find also from a full path linux-image-480-17-generic: /boot/vmlinuz-480-17-generic $ dpkg -S vmlinuz # dpkg is an alternative listing less packages linux-image-480-16-generic: /boot/vmlinuz-480-16-generic linux-image-480-17-generic: /boot/vmlinuz-480-17-generic linux-image-480-11-generic: /boot/vmlinuz-480-11-generic linux-image-440-9136-generic: /boot/vmlinuz-440-9136-generic linux-image-480-19-generic: /boot/vmlinuz-480-19-generic

Configuration and filesedit

/etc/apt has the apt configuration folders and files

apt-config is the APT Configuration Query program14 apt-config dump shows the configuration15


  • /etc/apt/sourceslist: Locations to fetch packages from
  • /etc/apt/sourceslistd/: Additional source list fragments
  • /etc/apt/aptconf: APT configuration file
  • /etc/apt/aptconfd/: APT configuration file fragments
  • /etc/apt/preferences: version preferences file This is where you would specify "pinning", ie a preference to get certain packages from a separate source or from a different version of a distribution
  • /var/cache/apt/archives/: storage area for retrieved package files
  • /var/cache/apt/archives/partial/: storage area for package files in transit
  • /var/lib/apt/lists/: storage area for state information for each package resource specified in sourceslist
  • /var/lib/apt/lists/partial/: storage area for state information in transit


APT relies on the concept of repositories in order to find software and resolve dependencies For apt, a repository is a directory containing packages along with an index file This can be specified as a networked or CDROM location The Debian project keeps a central repository of over 25,000 software packages ready for download and installation

Any number of additional repositories can be added to APT's sourceslist configuration file /etc/apt/sourceslist and then be queried by APT Graphical front-ends often allow modifying sourceslist more simply apt-setup Once a package repository has been specified like during the system installation, packages in that repository can be installed without specifying a source and will be kept up-to-date automatically

In addition to network repositories, compact discs and other storage media USB keydrive, hard disks can be used as well, using apt-cdrom16 or adding file:/17 to the source list file Apt-cdrom can specify a different folder than a cd-rom, using the -d option ie a hard disk or a USB keydrive The Debian CDs available for download contain Debian repositories This allows non-networked machines to be upgraded Also one can use apt-zip

Problems may appear when several sources offer the same packages Systems that have such possibly conflicting sources can use APT pinning to control which sources should be preferred

APT pinningedit

The APT pinning feature allows administrators to force APT to choose particular versions of packages which may be available in different versions from different repositories This allows administrators to ensure that packages are not upgraded to versions which may conflict with other packages on the system, or that have not been sufficiently tested for unwelcome changes

In order to do this, the pins in APT's preferences file /etc/apt/preferences must be modified,18 although graphical front-ends often make pinning simpler


Synaptic Package Manager is one of the front-ends available for APT

Several other front-ends to APT exist, which provide more advanced installation functions and more intuitive interfaces These include:

  • Synaptic, a GTK+ graphical user interface
  • Ubuntu Software Center, a GTK+ graphical user interface developed by the Ubuntu project
  • aptitude, a console client with CLI and ncurses-based TUI interfaces
  • KPackage, part of KDE
  • Adept Package Manager, a graphical user interface for KDE deb, rpm, bsd
  • PackageKit, a freedesktoporg frontend
  • GDebi, a GTK+-based tool sponsored for Ubuntu There is also a Qt version, available in the Ubuntu repositories a gdebi-kde
  • apt-cdrom, a way to add a new CDROM to APT's list of available sourceslists list of available repositories It is necessary to use apt-cdrom to add CDs to the APT system, it cannot be done by hand
  • apt-zip, a way to use apt with removable media, specifically USB flash drives
  • aptURL, an Ubuntu software package that enables end-user applications to install with a single-click1920
  • Cydia, a package manager for jailbroken iOS based on APT ported to iOS as part of the Telesphoreo project2122
  • gnome-apt, a GTK+/GNOME-widget-based graphical front-end Developed by Havoc Pennington23
  • Muon Discover previous Muon Software Center, a Qt-based graphical user interface
  • Hildon Application Manager Maemo Application, a Maemo front-end
  • apticron, a service designed to be run via cron to email notices of pending updates to a sysadmin
  • APT Daemon, a front-end that runs as a service to allow users to install software through PolicyKit and is in turn the framework used by Ubuntu Software Center along with the Linux Mint Software Manager

APT front-ends can:

  • Search for new packages
  • Upgrade packages
  • Install or remove packages
  • Upgrade the whole system to a new release

APT front-ends can list the dependencies of packages being installed or upgraded, ask the administrator if packages recommended or suggested by newly installed packages should be installed too, automatically install dependencies and perform other operations on the system such as removing obsolete files and packages


The original effort that led to the apt-get program was the dselect replacement project known by its codename deity24 This project was commissioned by Brian White, the Debian Release Manager at the time The very first functional version of apt-get was called dpkg-get and was only intended to be a test program for the core library functions that would underpin the new UI25

Much of the original development of APT was done on IRC, so records have been lost The 'Deity Creation Team' mailing list archives include only the major highlights

The Deity name was abandoned as the official name for the project due to concerns over the religious nature of the name The APT name was eventually decided after considerable internal and public discussion Ultimately the name was proposed on IRC, accepted and then finalized on the mailing lists26

APT was introduced in 1998 and original test builds were circulated on IRC The first Debian version that included it was Debian 21, released on 9 March 199927

In the end the original goal of the Deity project of replacing the dselect user interface UI was a failure Work on the UI portion of the project was abandoned the UI directories were removed from the CVS system after the first public release of apt-get The response to APT as a dselect method and a command line utility was so great and positive that all development efforts focused on maintaining and improving the tool It was not until much later that several independent people built UIs on top of libapt-pkg

Eventually, a new team picked up the project, began to build new features and released version 06 of APT which introduced the Secure APT feature, using strong cryptographic signing to authenticate the package repositories28

See alsoedit

  • Free software portal
  • Alien
  • AppStream
  • apt-file
  • APTonCD
  • GNU Guix
  • Wajig
  • ZYpp


  1. ^ Julian Andres Klode 13 March 2016 "Accepted apt 10983 source all amd64 into proposed-updates->stable-new, proposed-updates" Debian Package Tracker The Debian Project Retrieved 11 April 2016 
  2. ^ "Accepted apt 13~exp1 source into experimental" Debian Package Tracker The Debian Project 11 May 2016 Retrieved 11 May 2016 
  3. ^ a b "apt-get8 - Linux man page" linuxdienet Archived from the original on 16 May 2008 Retrieved 2008-05-12 
  4. ^ "APT-RPM" apt-rpmorg Archived from the original on 21 April 2008 Retrieved 2008-05-12 
  5. ^ "Fink - About" wwwfinkprojectorg Archived from the original on 11 May 2008 Retrieved 2008-05-12 
  6. ^ Byfield, Bruce 2004-12-09 "An apt-get primer" Archived from the original on 2010-04-19 
  7. ^ "From the archives: the best distros of 2000" Tux Radar 
  8. ^ Dorgan, David 2004-01-19 "Migrating to Debian" linuxie Archived from the original on 2010-04-19 
  9. ^ "Mobile Linux development with Familiar and a minimal Debian" Mobile Tux 
  10. ^ "Why Debian" 
  11. ^ "Debian policy manual" 
  12. ^ "Linux Man pages" 
  13. ^ "Discussion on dist-upgrade vs full-upgrade" 
  14. ^ "Apt-Config" 
  15. ^ "Query APT Configuration Using apt-config - Debian Admin" 
  16. ^ "apt-cdrom" 
  17. ^ ie Deb file:/mnt/install stable main contrib non-free 
  18. ^ "Apt Pinning" Debian Wiki Archived from the original on 4 October 2006 Retrieved 2006-09-19 
  19. ^ "AptURL" Ubuntu Wiki Retrieved 16 April 2016 
  20. ^ "OzOS | apt:foo" 
  21. ^ Jurick, David 2009 iPhone Hacks: Pushing the iPhone and iPod touch Beyond Their Limits O'Reilly Media, Inc p 20 ISBN 9780596516642 Retrieved January 18, 2013 
  22. ^ Adhikari, Richard March 20, 2008 "Android, Schmandroid: Linux on the iPhone" LinuxInsider Retrieved January 18, 2013 
  23. ^ The Evolution of Debian Package Management Systems, By Glenn Mullikin, AUUGN, Dec 2001, Page 50, gnome-apt was written by Havoc Pennington
  24. ^ "Deity Mailing List, 1997-04" 
  25. ^ "Deity Mailing List, 1998-03" 
  26. ^ "Deity Mailing List, 1998-03" 
  27. ^ "A Brief History of Debian" Debianorg 
  28. ^ "Secure APT" Debian Wiki Retrieved 2006-09-05 

External linksedit

  • apt8 – Debian Maintenance Commands Manual
  • Apt Tutorial

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