Upgrading 15.04 to latest release 16.04
1520
How to install software or upgrade from an old unsupported release?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
45553
How do I install the latest stable version of Firefox?
151605
upgrading from 15.10 to 16.04 apt not installed
100135
What does "upgrade to 18.04" mean?
158735
How to update Wine to the latest version?
101714
Is there any way to roll back the most recent upgrade?
60659
Install newer package version from trusty-backports
120229
Understanding various update and upgrade commands
74990
Error while trying to upgrade from Ubuntu 18.04 to 18.10: "Please install all available updates for your release before upgrading."
63278
Update Linux Subsystem on Windows (Ubuntu) to 16.04
67481
How to revert a do-release-upgrade?
119971
Install 17.10 on 32 bit machine
24165
Upgrade to version newer than repositories
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
35146
Will apt-get dist-upgrade upgrade my system to newer version?