Update from 18.04 to Ubuntu 20.04 problem
8295
E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable)
120161
Ubuntu 19.04 problems install upgrades
76905
Failure [INSTALL_FAILED_ALREADY_EXISTS] when I tried to update my application
52190
How and when is old-releases.ubuntu.com updated?
30747
Encountered "/usr/sbin/grub-mkconfig: 8: /etc/default/grub: 4: not found" error while updating
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
57183
Problem with upgrading 19.04 to 19.10 "UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte
83216
apt get update missing release file
43648
Why isn't an upgrade to 20.04 from 18.04 available yet?
109902
Will I lose the already installed applications if I upgrade from ubuntu 18.04 to 20.04
65808
17.10 to 18.04 upgrade freezes during boot
5316
Update from 14.04 to 16.04 failed with GPG error
58888
Change Ubuntu 17.04 to Ubuntu 16.04.2 LTS
50810
No upgrade available for 19.04 from 18.10
140850
Why does do-release-upgrade on Xubuntu running version 18.04 not offer to update to 20.04.1?
63176
How can I update to Ubuntu 21.04?
25678
How to do a minimal install of 20.04?