Upgrade problem 12.04 to 14.04
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?
64744
Restarted computer during update; "the system network service is not compatible with this version"
86777
Distribution upgrade problem "No new release found"
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
144507
No facility exists in Update Manager to upgrade to a new version, why?
30754
Cannot update: "No available releases found"
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
404
Last upgrade crashes network manager (no internet connection, no applet)
101714
Is there any way to roll back the most recent upgrade?
72152
Upgrading 16.04 to 16.04.1
98844
upgrade 14.04 with errors and shows red sign on top
12614
Upgrade problem
107009
ubuntu 18.04 apt-get upgrade problem "redirection loop encountered."
103929
sudo apt upgrade error 18.04 (Broken Packages)
20751
Problem upgrading Ubuntu 9.10
65099
Unable to install any updates through update manager/apt-get upgrade