So the upgrade offer notification came through today, and as this presumably means it's tested and ready for release, I decided to go for it...

Things did not go well. Everything seemed fine and normal through most of the process, but it appears to have failed right at the final hurdle. It went through downloading of the new packages fine. Last time I looked it was at 98% of the installation of the new packages, so I'm assuming it completed that too.

However, when I came back to it, instead of inviting me to reboot into my new system, the dist upgrade app was no longer running, and my system was in a semi-functional state where I couldn't launch anything from the GUI to try to see what had happened, nor could I reboot using the GUI.

I used ctrl-alt-F2 to get into text-mode tty and issued the reboot command from there. The system now boots to a very different looking login prompt, presumably the new 20.04 theme, but It won't login. Logging in to the text-mode tty reveals that it still thinks it's version 5.19, and shows 1335 packages can be updated. I guess this means that whatever final stages should have come after the package installation were not completed.

I tried 'dpkg --configure -a', but it does nothing. The system has no internet. Any idea on how to rescue this?

Update: I was able to get the network up using nmcli.

I tried running 'sudo do-release-upgrade', but it's telling me 'Please install all available updates for your release before upgrading'

I believe if I use apt or pkcon to do this, it will likely overwrite all the 20.04 packages with 18.04 ones. Is there any way to bypass this check and get it to pick up where it left off?

You could

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tail /etc/apt/sources.list

If they say "bionic", it will update from the 18 base. If they say "focal"...