Comment 1 for bug 1799319

I got some help on this in the original bug report I started with:

https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1799009

Manually running apt update - apt upgrade resulted in about a dozen packages getting updated. This was after Software Updater told me my system was up to date, but a new release was available. So, the core issue appears to be that Software Updater is missing updates that are only detected by manually running apt update.

After running apt update - apt upgrade, I am now in the process of running do-release-upgrade.