The repository 'http://ppa.launchpad.net/armagetronad-dev/ppa/ubuntu bionic Release' does not have a Release file
10101
How can PPAs be removed?
153900
How do I install Adobe Acrobat Reader from the repository?
48418
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available:
92807
There's an issue with an Alpha/Beta Release of Ubuntu, what should I do?
122274
Release file for http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet
117112
Why isn't Ubuntu moving its repositories to old-releases anymore?
107786
PPA error while installing Albert application launcher in Ubuntu 18.04
15183
Elementary OS PPA gives “The repository does not have a Release file.” error
83216
apt get update missing release file
15021
How to create a local APT repository?
46419
The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release file
78428
Failed to fetch jessie backports repository
93942
How to fix "Failed to download repository information" error while updating?
112879
W: The repository 'http://download.fpcomplete.com/ubuntu yakkety Release' is not signed
85250
Skipping acquire of configured file 'xxxx' as repository 'xxxx xenial InRelease' doesn't support architecture 'i386'"
82035
Debian: The repository does not have a Release file
74185
How can I add a PPA from a previous release?