Error messages when updating ubuntu 16.04 LTS
991
How can I fix apt error "W: Target Packages ... is configured multiple times"?
30754
Cannot update: "No available releases found"
10633
software updater failed to download repository information
46720
sudo apt update error: "Release file is not yet valid"
11579
Broken dependencies after upgrade
154622
How do I resolve this installation error?
30747
Encountered "/usr/sbin/grub-mkconfig: 8: /etc/default/grub: 4: not found" error while updating
120161
Ubuntu 19.04 problems install upgrades
13308
Ubuntu 14.04 LTS showing 'version message write failed' message while booting
5316
Update from 14.04 to 16.04 failed with GPG error
144507
No facility exists in Update Manager to upgrade to a new version, why?
23096
How to remove obsolete packages after failed release upgrade via do-release-upgrade on Ubuntu?
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
58931
16.04 Upgrade: Failed to fetch Empty files can't be valid archives
21184
Running "sudo apt-get update" returns connection errors
5820
How to fix the “Unable to calculate upgrade” issue from command line when upgrading from 12.04 to 14.04?
72152
Upgrading 16.04 to 16.04.1