Unable to update ubuntu 12.04
4305
How do I fix a "Problem with MergeList" or "status file could not be parsed" error when trying to do an update?
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
80794
Ubuntu 18.04 stuck at upgrading linux-header
13970
Why am I not getting the Ubuntu 18.04 upgrade?
46424
Cannot update software center repositories
64509
Can't update from official repositories [Error 409]
12614
Upgrade problem
144507
No facility exists in Update Manager to upgrade to a new version, why?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
149984
Can't update or install anything. Ubuntu 3.11.0.14
17645
Unable to upgrade pip
33651
How to upgrade from Ubuntu 12.10 to 14.04
31506
How do I update Ubuntu manually?
112955
How can I upgrade Ubuntu from 19.10 to 20.04 without losing packages?
12578
How do I upgrade to a newer version of Ubuntu?
1520
How to install software or upgrade from an old unsupported release?