404 errors and "repository does not have a release file" when using 'sudo apt update'
65
What can I do if a repository/PPA does not have a Release file?
62855
sudo add-apt-repository throws an exception
34720
What is the difference in command-line "sudo apt-get update" and using Synaptic or Auto-updater?
73083
failed to connect to http://changelogs.ubuntu.com/meta-release
121873
sudo apt-offline install not updating
151584
Why doesn't the command do-release-upgrade doesn't require sudo?
4305
How do I fix a "Problem with MergeList" or "status file could not be parsed" error when trying to do an update?
102708
Apt "could not find a distribution template" error
99687
update-alternatives --install says it needs link name path priority?
44313
How to run "sudo apt-get update" through proxy in commandline?
69960
What is sudo apt-get -f install?
94171
Why Does Software Updater Say No updates Available, but apt-get upgrade Shows updates available?
15413
sudo apt update always giving Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
152479
Why are apt-get repositories hardcoded to a specific release?
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
83924
error while trying to sudo apt-get update GPG, no sign repository
1520
How to install software or upgrade from an old unsupported release?