I get the following error message when I try to upgrade to 20.10:
'Failed to connect to https://changelogs.ubuntu.com/meta-release. Check your Internet connection or proxy settings'
I can display the contents of the file in chrome.
I have tried deleting and regenerating the motd file as described at failed to connect to http://changelogs.ubuntu.com/meta-release to no effect.
I am using 'sudo do-release-upgrade -c' to do the upgrade, I have also tried 'sudo update-manager' to no effect.