upgrade to a new version
1520
How to install software or upgrade from an old unsupported release?
33651
How to upgrade from Ubuntu 12.10 to 14.04
3353
Do I have to recompile my application when I upgrade a third party jar?
66915
How to request a package upgrade in the next Ubuntu release
211
Can I skip over releases when upgrading?
111573
What's the best way to re-enable PPAs/repos after an upgrade?
29191
Upgrade to 18.04 from 17.10
19288
Update manager doesn't offer an upgrade to the new release
35146
Will apt-get dist-upgrade upgrade my system to newer version?
101714
Is there any way to roll back the most recent upgrade?
50810
No upgrade available for 19.04 from 18.10
100135
What does "upgrade to 18.04" mean?
64558
What does `do-release-upgrade` really do?
15687
How do I resume a release upgrade?
43279
Alternative Method to Acquire El Capitan Upgrade
7580
How to safely upgrade from an older Ubuntu version to a newer one?
129223
Ubuntu upgrade from 17.04 to 18.04