Ubuntu 17.04 Update Issue
6809
How do I fix the GPG error "NO_PUBKEY"?
8525
Error Updating: izx/askubuntu/ubuntu xenial Release' does not have a Release file
154072
Ubuntu 17.10 doesn't show up in update-manager
1520
How to install software or upgrade from an old unsupported release?
113145
What does 'apt-get install update' do?
46720
sudo apt update error: "Release file is not yet valid"
5877
"Failed to fetch" while updating
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
56150
Can't upgrade/update ubuntu 18.04 as apt/dpkg error is showing up
140850
Why does do-release-upgrade on Xubuntu running version 18.04 not offer to update to 20.04.1?
117728
sudo apt update error
21382
What does "sudo apt-get update" do?
30747
Encountered "/usr/sbin/grub-mkconfig: 8: /etc/default/grub: 4: not found" error while updating
92807
There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?
27109
After the upgrade to 17.10 I only get a black screen. How do I fix this?
58888
Change Ubuntu 17.04 to Ubuntu 16.04.2 LTS
130150
SQL Server 2017 Installation issues