apt update I'm suddenly getting the following error:
E: The repository 'mirror://mirrors.ubuntu.com/mirrors.txt focal Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
I'm running elementary OS 6.1 Jólnir Built on Ubuntu 20.04.3 LTS
This seems to match the