Unable to update: failed to refresh cache:E:The repository 'http://ppa.launchpad.net/gnome-shell-extensions/ppa/Ubuntu disco release'
65
What can I do if a repository/PPA does not have a Release file?
51350
While updating the ubuntu 16.04 does not have a Release file Error
46424
Cannot update software center repositories
109277
Can't Add ppa:x2go/stable
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
122274
Release file for http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet
150705
Error: Refresh failed because resolved configuration is not available
86777
Distribution upgrade problem "No new release found"
46720
sudo apt update error: "Release file is not yet valid"
100494
Update Manager asking me to update kernel but apt-get upgrade does not?
135383
Unable to update my system Ubuntu13.04: Getting message - requires installation of untrusted packages
119943
Where can I find a repository for older unsupported releases?
140893
Error when using apt-get update
15183
Elementary OS PPA gives “The repository does not have a Release file.” error
85988
How to set up an apt-cacher server?
140371
Update Ubuntu 10.04
117728
sudo apt update error