How do I upgrade to 16.04 with Ubuntu Gnome 14.04?
11556
Can I smoothly upgrade from one LTS to next LTS release?
60659
Install newer package version from trusty-backports
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
13970
Why am I not getting the Ubuntu 18.04 upgrade?
35093
Upgrading from the command line?
58888
Change Ubuntu 17.04 to Ubuntu 16.04.2 LTS
23582
How to revert to GNOME Classic Desktop?
33807
Is there any safe way to remove GNOME Software in 16.04 and install the classic Ubuntu Software Center?
135965
How to install Gnome 3 without breaking Unity?
63278
Update Linux Subsystem on Windows (Ubuntu) to 16.04
149654
How to uninstall and reinstall GNOME 3.10?
88329
Canonical replacing Unity with gnome-shell in Ubuntu 18.04 what now?
24165
Upgrade to version newer than repositories
1520
How to install software or upgrade from an old unsupported release?
20399
How do I upgrade from 14.04 LTS to 16.04.1 LTS?
87236
How to upgrade Ubuntu 12.04 to 13.10?
9901
How to upgrade from 18.10 to 19.10, using the command line?