Switching back to an older version having high period of security and maintenance
2136
How to roll back Ubuntu to a previous version?
106872
What are the potential security issues when I keep using Windows XP?
156797
Can we simply rename an app if they are different versions and keep them both?
36848
How do I safely install an older/newer version of Python?
67481
How to revert a do-release-upgrade?
26376
Kept back upgrade of fwupd
12578
How do I upgrade to a newer version of Ubuntu?
143305
how to avoid the "downloaded application" warning for a Standard User
94446
Revert to upstart
3652
How do I change my login provider(s)?
106361
How to Return to an already open application when a user tries to open a new instance if same version?
65726
Can changing desktops environments affect my programs/personal data?
33658
What is the quickest and safest way to test new software and revert all changes, if needed?
142124
Permanently Disabling System Integrity Protection
11556
Can I smoothly upgrade from one LTS to next LTS release?
43236
Should I upgrade when a development branch becomes stable?
79358
Upgrade High-Trust Addin/App from 2013 to 2016