Unable to install from old PPA
65
What can I do if a repository/PPA does not have a Release file?
47794
Nvidia driver 410 listed by ppa and ubuntu-drivers but does not seem to be installable via apt
154622
How do I resolve this installation error?
39582
Difference between "ppa-purge" and "add-apt-repository -r"?
42792
Docker ppa package for Ubuntu 19.10
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
37152
Is there a PPA for the latest Blender version?
20398
dpkg broken after 15.04 upgrade fail
151656
Installing from source. How to resolve dependencies without destroying the package manager
151066
Failed to fetch PPA Error (Deluge)
109277
Can't Add ppa:x2go/stable
28788
How do I create a PPA?
36848
How do I safely install an older/newer version of Python?
41519
What can I do if a package is not available on the newest version of Ubuntu (18.04) but is available on older versions?
47843
Upgraded to Chrome 61.0.3163 via ppa on Ubuntu 16.04 but it won't launch because NSS out of date
32426
How to install packages?
95336
Installing particular versions when repo has newer versions?