I use Ubuntu Studio 20.04.1 LTS (64 bit Linux).
I want to know if there is some GUI App and/or a Bash command (command line) to full eliminate any package which is not from the official Ubuntu repositories.
Is there something like this?
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related: https://askubuntu.com/questions/8560/how-do-i-find-out-which-repository-a-package-comes-from – pLumo Sep 23 '20 at 07:36
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...and [Find local packages](https://askubuntu.com/a/1229887/986805) – Sep 23 '20 at 07:42