Can 3rd-party package repositories be trusted? (Are there criteria to test if they're trustworthy?)
8282
Are PPAs safe to add to my system and what are some "red flags" to watch out for?
158379
How do you add Debian experimental repo to Ubuntu, for those understanding the risks associated?
41054
How can I check the available version of a package in the repositories?
100850
What's the -practical- difference between a Bare and non-Bare repository?
130228
How do I mark a .desktop file as trusted in Ubuntu 18.04?
111810
How do I check the checksum of a download and why should I?
151656
Installing from source. How to resolve dependencies without destroying the package manager
81115
Find what packages are installed from a repository
22405
What does "You have requested package `foo', but the package provides `foo'." mean?
5830
How to prevent updating of a specific package?
90593
How do I compare two git repositories?
105715
Security updates for the universe repository for LTS releases?
96810
Given a package name, how can I find out what will change if I install the package?
108315
Checking to see if a user has a licence for a managed package
3353
Do I have to recompile my application when I upgrade a third party jar?
16502
How can I know the dependencies of a certain package?
12054
How do I deal with "unauthenticated sources" errors in the Software Center?