Error: Xenial Release repository cdrom does not have a Release file
22164
Problem with sudo apt get update: The repository cdrom... does not have a Release file
24165
Upgrade to version newer than repositories
92739
E: The repository 'http://ppa.launchpad.net/jonathonf/python-3.6/ubuntu disco Release' does not have a Release file
55239
Cannot install packages in Mint: "Unable to fetch some archives"
93942
How to fix "Failed to download repository information" error while updating?
30754
Cannot update: "No available releases found"
145277
How do I resolve this error when installing the Forge source?
132495
14.04.5 to 16.04 Update failed - xenial.tar.gz.gpg missing
115648
dpkg exit with error "cannot scan updates directory `/var/lib/dpkg/updates/': No such file or directory", how to fix it?
4450
How can I reproduce the error "package... needs to be reinstalled, but I can't find an archive for it" for testing?
7671
I get an error with the archipack
118307
Why does upgrade from 12.04 to 12.10 using a CD/DVD still require download?
119943
Where can I find a repository for older unsupported releases?
90212
'http://download.opensuse.org/repositories/home:/strycore/xUbuntu_16.04 ./ Release' is not signed
153900
How do I install Adobe Acrobat Reader from the repository?
58931
16.04 Upgrade: Failed to fetch Empty files can't be valid archives
79030
Installing PHP 5.6 on Xenial (16.04)