Do package managers such as Synaptic and Apper check the hashes of installed as well as updated/downloaded packages by comparing them to online databases?
Do they maybe even identify packages by their hashes?
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3I think what you're looking for is already answered on superuser: https://superuser.com/questions/990143/how-does-apt-get-checks-for-the-integrity-of-the-files-downloaded – Michael Hirschler Jul 26 '17 at 18:27
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3How is the authenticity of Debian packages guaranteed? might also be relevant (I’m not suggesting it as a duplicate because of my gold hammer). – Stephen Kitt Jul 27 '17 at 11:49