Upgrade from 18.04 to 20.04 issues
991
How can I fix apt error "W: Target Packages ... is configured multiple times"?
75798
How to upgrade to the latest GNOME version?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
134080
Still can't upgrade? Is there a new delay?
54375
My Applications are not showing after upgrading from Ubuntu 18.04 to 20.04
101714
Is there any way to roll back the most recent upgrade?
147756
Update to 20.04: Missing icons and icon alignments
106321
Finding out if upgrading to a newer macOS version will cause issues?
118978
Not all updates can be installed: partial upgrade
64558
What does `do-release-upgrade` really do?
118307
Why does upgrade from 12.04 to 12.10 using a CD/DVD still require download?
83960
How do I change my update server in Ubuntu 18.04?
103929
sudo apt upgrade error 18.04 (Broken Packages)
7580
How to safely upgrade from an older Ubuntu version to a newer one?
30754
Cannot update: "No available releases found"
147789
Updating core from 8.4.4 to 8.6.1
76241
"no public key available" while upgrading using update-manager