Locked out of 15.04 after the latest update
2850
Ubuntu gets stuck in a login loop
106720
I can't access the root account anymore: user is not in the sudoers file
58759
How to fix missing GPG keys?
73973
After typing "apt-get update" terminal says Could not open lock file
40885
What should I do when I got the KEYEXPIRED error message after an apt-get update?
226
How do I reset a lost password (using recovery mode requires me to type the password)?
20398
dpkg broken after 15.04 upgrade fail
89603
How can I know if reboot is required after update?
7045
Why do I get "Required key not available" when install 3rd party kernel modules or after a kernel upgrade?
28212
Pokemon Go login issues after update
19361
Can't update because the word prox* is blocked
158778
How to re-enable the systray (indicator panel) after latest updates
98844
upgrade 14.04 with errors and shows red sign on top
89856
How to resume the interrupted upgrade from 14.10 to 15.04?
8526
Upgrading from Ubuntu 16.04 to 18.04 broke the system completely!
151780
MacBook Pro locked with Find My Mac and won't let me boot
19596
No more boot logging since 16.04?