Debian and derivatives Package Management

High and low-level package tools

high-level tools (which are in charge of ensuring that the tasks of dependency resolution and metadata searching are performed).

low-level tools (which handle in the backend the actual installation, upgrade, and removal of package files).

dkpg

dpkg is a low-level package manager for Debian-based systems. It can install, remove, provide information about and build *.deb packages but it can’t automatically download and install their corresponding dependencies.

When use dpkg?

  1. Package not available in repository
    You will most likely choose to install a package from a deb file when it not available in the distribution’s repositories and therefore cannot be downloaded and installed through a high-level tool. Since low-level tools do not perform dependency resolution, they will exit with an error if we try to install a package with unmet dependencies.

    # dpkg -i file.deb

  2. Listing installed packages
    When you first get your hands on an already working system, chances are you’ll want to know what packages are installed.

    • list all currently installed packages

      dpkg -l

  3. Find out file installed by which package

    dpkg --search /etc/nginx/nginx.conf

More Examples

  1. Remove a package from system

    dpkg -r package_name

    '-r' only remove package but leaves configuration files

    dpkg -P package_name

    '-P' will remove package along with it's configuration files

  2. View the contents of a deb package

    dpkg -c package_name.deb

  3. List the location of files installed from a package

    dpkg -L package_name

  4. Unpack a package without install or configure it

    dpkg --unpack package_name.deb

  5. Verify package integrity

    dpkg -V [package_name]

    Verifies the integrity of package-name or all packages if omitted, by comparing information from the installed paths with the database metadata.

atp

apt (Advanced Package Tool) is the command-line tool for handling packages.

apt equivalents
apt install apt-get install
apt search apt-cache search
apt show apt-cache show
apt update apt-get update
apt list --installed dpkg -l
apt edit-sources vi /etc/apt/sources.list
apt autoremove apt-get autoremove
apt puge apt-get puge ; aptitude puge

apt-get

apt-get is a high-level package manager for Debian and derivatives, and provides a simple way to retrieve and install packages, including dependency resolution, download and installation. Unlike dpkg, apt-get does not work directly with *.deb files, but with the package name.

  1. Download and unpack source code of package

    apt-get source vsftpd

  2. Download without installation

    apt-get download vsftpd

  3. Auto remove a package and it's sub-packages

    The ‘autoremove‘ sub command is used to auto remove packages that were certainly installed to satisfy dependencies for other packages and but they were now no longer required.

    apt-get autoremove vsftpd

  4. Clean up .deb cache files

    The ‘autoclean‘ command deletes all .deb files from /var/cache/apt/archives to free-up significant volume of disk space.

    apt-get autoclean

aptitude

aptitude is another high-level package manager for Debian-based systems, and can be used to perform management tasks (installing, upgrading, and removing packages, also handling dependency resolution automatically) in a fast and easy way. It provides the same functionality as apt-get and additional ones, such as offering access to several versions of a package.

When use aptitude?

  • Install or remove a package from repository
aptitude install package_name  
aptitude remove / purge package_name  

` The option remove will uninstall the package but leaving configuration files intact, whereas purge will erase every trace of the program from your system.

  • Search for a package
# aptitude search nginx
p   lua-nginx-memcached             - Pure Lua memcached client driver for the n  
p   lua-nginx-redis                 - Pure Lua redis client driver for the nginx  
i   nginx                           - small, powerful, scalable web/proxy server  
v   nginx:i386                      -  
i A nginx-common                    - small, powerful, scalable web/proxy server  
i A nginx-core                      - nginx web/proxy server (core version)  
Letter Meaning
p no trace of the package exists on the system
i the package is installed
v the package is virtual
A the package was automatically installed