Comment 9 for bug 1959993

As a point of clarification here the release upgrade process skips interim releases once they become end of life, so if one were to upgrade from Focal they would upgrade to Impish or Jammy (depending on how their system is configured). It looks like I made this change 7 years ago (gasp!).

https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1497024