How to add a package from a later version of an ubuntu?
122462
Install a single specific package from future distribution
154712
How to install a package from an older version of TeXLive?
133328
How to install python3 version of package via pip on Ubuntu?
69200
How do I reinstall Ubuntu Software in Ubuntu 20.04 LTS version?
6851
How do I install the ubuntu-restricted-extras package?
122742
Why does apt-get install a newer dependency than supported by the specified package
66915
How to request a package upgrade in the next Ubuntu release
86185
How to install a list of packages using apt-get?
131490
How do I save Updates/Installed Packages?
2136
How to roll back Ubuntu to a previous version?
63176
How can I update to Ubuntu 21.04?
89366
Which package version am I using?
61516
Where can I get the repositories for old Ubuntu versions?
32200
How do I downgrade a package?
45993
How to keep up with packages and know which ones are obsolete?
44613
PPA & Packaging: Having versions of packages for multiple distros
18622
How do I install a different Python version using apt-get?