Installing an older version of an emacs package
139753
Is it possible to downgrade packages installed with ELPA?
58032
How to install the previous version of a .deb package and pin it?
18622
How do I install a different Python version using apt-get?
45993
How to keep up with packages and know which ones are obsolete?
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?
103280
Installing gcc-7 (and newer packages) in Ubuntu 16.04
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
7580
How to safely upgrade from an older Ubuntu version to a newer one?
157525
How to delete old versions of same packages from a Local Repository?
85472
How do I install the latest version of cmake from the command line?
127852
How do I update a program installed from a manually-downloaded deb package?
50897
Download older version of Xcode?
91875
How can I install a specific version of a set of Perl modules?
60659
Install newer package version from trusty-backports
27793
How do I install the latest Python 2.7.X or 3.X on Ubuntu?
94545
How to update ubuntu's python with latest version from source?
8078
How do I install an individual package on a Linux system?