Can you go back from 18.10 to 18.04 LTS?
2136
How to roll back Ubuntu to a previous version?
113056
How to upgrade from 12.04 to 12.10 using CD?
59088
How to upgrade to a newer release of Ubuntu using the Live CD?
100963
How to only perform LTS upgrades?
4660
Should I be offered the option to upgrade to 18.04.1?
43778
Is it possible to "upgrade" from a 32bit to a 64bit installation?
94446
Revert to upstart
99175
How to "undo" SetOptions (restore defaults)?
1520
How to install software or upgrade from an old unsupported release?
100135
What does "upgrade to 18.04" mean?
13970
Why am I not getting the Ubuntu 18.04 upgrade?
67481
How to revert a do-release-upgrade?
35243
Is it safe to do-release-upgrade from 12.04.4 to 14.04.1?
15687
How do I resume a release upgrade?
46084
Can I downgrade from macOS Sierra to Snow Leopard (OS X 10.6)?
64267
Where do I find older Ubuntu versions (specifically 11.10)
46261
I need an equivalent of gksu in 18.04