Can't upgrade due to 404 error
1520
How to install software or upgrade from an old unsupported release?
110111
HTTP Status 404 - The requested resource (/ProjectName/) is not available
107009
ubuntu 18.04 apt-get upgrade problem "redirection loop encountered."
150705
Error: Refresh failed because resolved configuration is not available
63176
How can I update to Ubuntu 21.04?
64509
Can't update from official repositories [Error 409]
142807
Can't update RVM - "fatal: Unable to find remote helper for 'http'"
4305
How do I fix a "Problem with MergeList" or "status file could not be parsed" error when trying to do an update?
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
43648
Why isn't an upgrade to 20.04 from 18.04 available yet?
13720
apt-get update fails to fetch files, “Temporary failure resolving …” error
83960
How do I change my update server in Ubuntu 18.04?
134080
Still can't upgrade? Is there a new delay?
154420
"Failed to download repository information" error
30754
Cannot update: "No available releases found"
61473
Failed to fetch because of size mismatch error while upgrading
113379
Updating the repository isn't working