It wont let me upgrade to ubuntu 13.04
36703
How do I upgrade from 12.10 to 13.04?
116445
"Can't check signature: public key not found" while upgrading, why?
144172
How to upgrade to a point release from the same base release (12.04 to 12.04.03)
2136
How to roll back Ubuntu to a previous version?
413
How do I install Ubuntu?
123413
Will apt-get dist-upgrade upgrade my system to a newer version?
41519
What can I do if a package is not available on the newest version of Ubuntu (18.04) but is available on older versions?
80794
Ubuntu 18.04 stuck at upgrading linux-header
3969
Can't login to Ubuntu 14.04 after upgrade
5882
How to upgrade Ubuntu from an ISO image
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
80233
Upgrade to 20.04 from 19.10 isn't available
19288
Update manager doesn't offer an upgrade to the new release
35146
Will apt-get dist-upgrade upgrade my system to newer version?
29191
Upgrade to 18.04 from 17.10
134080
Still can't upgrade? Is there a new delay?
154622
How do I resolve this installation error?