Let's have a look at its syntax through some realistic case studies of this mechanism. apt-get is a command from the APT suite of tools that is used to install, upgrade or remove software packages in Debian and Debian-based Linux distributions. It also gives the name of the distribution (usually Stable, Testing, Unstable or Experimental for the standard distributions provided by Debian) together with its version (for example, 11 for Debian Bullseye). It specifies the origin (usually “Debian” for the packages of official mirrors, but it can also be a person's or an organization's name for third-party repositories). Every package source is identified by the information contained in a Release file that APT downloads together with the Packages files. The available selection criteria include the package's name and the source providing it. Receiving a GPG error when running apt-get update Install Docker Engine, containerd, and Docker Compose.
If several generic entries exist, the first match is used. Update the apt package index: sudo apt-get update. Each package is a package name, not a fully qualified filename. The first thing to say is that apt-get install does not choose where to install a package, but the package itself specifies that information. apt-get install is followed by one or more packages desired for installation or upgrading. The first: apt-get, deb packages, and source packages.
Can be run as part of the package installation or as a separate step. I don't know if I understood the problem correctly, so the answer goes in two directions. When APT checks /etc/apt/preferences and /etc/apt/preferences.d/, it first takes into account the most specific entries (often those specifying the concerned package), then the more generic ones (including, for example, all the packages of a distribution). Run the equivalent of apt-get update before the operation.
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