Let's have a look at its syntax through some realistic case studies of this mechanism. The command doesn’t upgrade packages that require removal of installed packages. To upgrade the installed packages to their latest versions run: sudo apt upgrade. 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). Upgrading packages ( apt upgrade) Regularly updating your Linux system is one of the most important aspects of overall system security. 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). It may also remove some packages in this process. If necessary, the apt-get command will try to upgrade important packages at the expense of less important ones. Every package source is identified by the information contained in a Release file that APT downloads together with the Packages files. This command performs the function of upgrade, and also handles changing dependencies with new versions of packages. This command downloads the updated package information as specified in the sources file when executed. The available selection criteria include the package's name and the source providing it. The system tracks changes to each package when a new version is released using either the 'apt-get update' or 'apt update' command. If several generic entries exist, the first match is used. 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).
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