My system rejects anything I install from the internet because it can't "verify" the repository
6809
How do I fix the GPG error "NO_PUBKEY"?
47062
How is the authenticity of Ubuntu updates verified?
118549
Setting up a repository server
12206
How can I tell if a CVE has been fixed in Ubuntu's repositories?
7107
How do I enable the source code repositories?
113379
Updating the repository isn't working
44991
A lot of missing dependencies when I try to install all software
75879
How do I get add-apt-repository to work through a proxy?
4945
How do I enable the "Universe" repository from the command line?
26745
Skipping acquire of configured file 'contrib/binary-i386/Packages' as repository ... doesn't support architecture 'i386'
128505
"macOS Catalina" could not be verified
41844
Package Install via Market sometimes fails and gives seemingly random error message
135985
Apt-get saying "Unable to correct problems, you have held broken packages."
26952
Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'xxx' doesn't support architecture 'i386'
59768
How do I enable the "multiverse" repository?
79410
How do I find out which repository a package comes from?
154815
How do I add a repository from behind a proxy?