Roll back Ubuntu 16.04 to 14.04
2136
How to roll back Ubuntu to a previous version?
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?
33540
How can I switch a 32-bit installation to a 64-bit one?
21323
Where can I download the latest release of Ubuntu?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
15687
How do I resume a release upgrade?
211
Can I skip over releases when upgrading?
10709
Can i upgrade ubuntu without losing my apps and files?
102366
How to wipe and install ubuntu?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
60659
Install newer package version from trusty-backports
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
32775
Inno Setup: How to automatically uninstall previous installed version?
12578
How do I upgrade to a newer version of Ubuntu?
82509
Going back to a previous Ubuntu state
23582
How to revert to GNOME Classic Desktop?
62881
After upgrading from Ubuntu 14.04 LTS to 16.04 LTS, last process left cleaning, how to perform?