Tried running sudo apt-get update and it can't find the release files
133
How can I fix a 404 Error when using a PPA or updating my package lists?
4124
I cannot run apt update properly - apt update hangs
59119
apt-get, unmet dependencies, ... "but it is not going to be installed"
115722
Apt sources.list problem , packages not found?
92739
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu disco Release' does not have a Release file
135985
Apt-get saying "Unable to correct problems, you have held broken packages."
28650
`apt-get update` cannot find Ubuntu servers
84803
sudo apt get update gives error - The package cache file is corrupted
156977
Unable to install files with apt-get: "unable to locate package"
108510
apt-get update very slow, stuck at "Waiting for headers"
12534
14.04 --> 16.04 failed; apt (>= 1.0.1ubuntu2.13)' is not installed
90937
apt-get update errors
61177
How to set up an APT repository?
72596
Where are the logs for apt-get?
30754
Cannot update: "No available releases found"
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
114246
apt-get update, unlinking