Debian

• APT essentials

  The apt, apt-get, and dpkg commands that cover almost everything you'll do to manage packages on Debian, and how remove differs from purge.

• Installing a .deb by hand

  Install a downloaded .deb the way that resolves its dependencies, see what dpkg -i leaves behind when you don't, and read the package before you trust it.

• Listing what is installed

  List installed packages reliably with dpkg-query, tell what you asked for from what came along, and find out when a package arrived from the logs.

• Debian's release channels

  What stable, testing, unstable and backports each mean, why the suite name in your sources file matters more than you think, and which to run.

• Managing services with systemd

  How Debian ships, enables and starts systemd services, where unit files live, and how to override a packaged unit without ever editing it.

• Adding a third-party repository safely

  Why apt-key is gone, how Signed-By scopes a vendor's key to their repository alone, and how to stop that repository replacing the rest of your system.

• Which package provides a file

  Trace a file to the package that ships it: dpkg -S for what is installed, apt-file for what is not, and the files that belong to no package at all.

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