Will upgrading to a newer version delete my files, apps, or settings?
68597
Will upgrading Ubuntu remove installed software?
70726
Windows (7, 8, 10) - Is a clean install better than an upgrade and if so why? (be specific)
131490
How do I save Updates/Installed Packages?
65079
How can I backup my programs/applications, so that after I reinstall a new one, I can still use the backup-ed ones?
138763
How to revert uncommitted changes including files and folders?
121201
Why can't I update applications without upgrading the whole OS?
67481
How to revert a do-release-upgrade?
126382
Where does aptitude store files during an upgrade?
71449
How can I revert a config file back to the originally installed version after I have edited it?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
92091
Which default programs can be safely uninstalled?
98421
How will people upgrade from 12.10 to later releases after 13.04 is EOL?
76772
Is it safe to delete from C:\Windows\Installer?
146297
What are the disadvantages of removing the application directories instead of using uninstallers?
5114
Can I delete any of the default apps the come with OS X?
125976
What Happens When I Upgrade Ubuntu?
157525
How to delete old versions of same packages from a Local Repository?