Why am I unsuccessful in upgrading from 10.04 to 12.04?
1520
How to install software or upgrade from an old unsupported release?
13970
Why am I not getting the Ubuntu 18.04 upgrade?
123413
Will apt-get dist-upgrade upgrade my system to a newer version?
101714
Is there any way to roll back the most recent upgrade?
80794
Ubuntu 18.04 stuck at upgrading linux-header
142310
Ubuntu 12.04 software upgrade does not show 12.10 upgrade
5877
"Failed to fetch" while updating
86777
Distribution upgrade problem "No new release found"
118307
Why does upgrade from 12.04 to 12.10 using a CD/DVD still require download?
93942
How to fix "Failed to download repository information" error while updating?
97346
Is it possible to skip releases during an upgrade?
115421
Ubuntu 13.10 to 14.04 Lts does not upgrade, keeps showing error
12614
Upgrade problem
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
74990
Error while trying to upgrade from Ubuntu 18.04 to 18.10: "Please install all available updates for your release before upgrading."
51768
Could not calculate the upgrade, what happened?
77705
Unable to upgrade in ubuntu