![]() ![]() When removing a snap, the package is unmounted and removed. Moreover it is mounted (its contents made visible directly) and the software is executed in a controlled environment inside your system (think of sandboxing and virtual machines). A snap package is not unpacked into the system. Snapcraft is an alternative to the package manager geared towards being compatible not only with Debian-derived Ubuntu, but with all Linux distributions. The package manager will never update this package since it does not know where it came from. You can also download DEB files manually. Installation by package manager, manual download On a side-note: From personal experience, I advise to remove all packages installed from non-default repositories before doing an upgrade from one Ubuntu release to the next one. The user must take care when adding custom repositories – they must be made for the system. Installing, removing and updating works exactly the same. The package manager will regard them just like the default repositories. It is also possible to expand upon the default repositories by adding URLs to /etc/apt/sources.list, although these days /etc/apt// should be used. Installation by package manager, custom repositories The new version is then installed as described above. The package manager knows which files to remove as it knows which file was provided by which package. The current version is removed from the system. When updating software by apt upgrade or apt dist-upgrade, new versions of existing packages are downloaded. Additionally, the package may contain some code which will be automatically executed once for setting up the newly installed software. The archive is unpacked into your local file-system. The package is provided as an archive in the DEB format. ![]() When installing a package by apt install, the package manager checks its local cache to determine where to download the package from. It stores the information in a local cache. When running apt update, the package manager queries the repository so it knows which software packages are available. The repositories' URLs are stored in /etc/apt/sources.list. Such a location is called a "repository". This software is generally trustworthy, known to work and mostly well maintained. The package manager (no matter if apt, apt-get, aptitude or whatnot) has a list of locations to download software from. In order to give a complete answer, I want to describe all of them: Installation by package manager, default repositories There are many ways to install software packages on Ubuntu, some of them you have not mentioned. ![]()
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