How to fix "The repository ... does not have a Release file" on Ubuntu 16.04.6?
92739
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu disco Release' does not have a Release file
66285
Package repository down, how to relocate?
132495
14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing
156977
Unable to install files with apt-get: "unable to locate package"
41519
What can I do if a package is not available on the newest version of Ubuntu (18.04) but is available on older versions?
46419
The repository 'http://dl.google.com/linux/chrome/deb stable Release' does not have a Release file
743
How do I enable the "Universe" repository?
139458
How to download packages from a command-line given repository?
61516
Where can I get the repositories for old Ubuntu versions?
154815
How do I add a repository from behind a proxy?
112568
Cannot remove a repository that complains it has no public key
19749
How to debug an unmet dependencies problem?
122274
Release file for http://archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease is not valid yet
26952
Skipping acquire of configured file 'main/binary-i386/Packages' as repository 'xxx' doesn't support architecture 'i386'
54571
How do I install the latest version of Git with apt?
79163
Sources missing in /etc/apt/sources.list, how do I get them back?
115648
dpkg exit with error "cannot scan updates directory `/var/lib/dpkg/updates/': No such file or directory", how to fix it?