Comment 6 for bug 1986346

@ JamesRichardson (james-time4tea)

Thank you for reporting this, you might have saved me a few hours.

I've had the exact same error (I agree, quite horrible), but I managed to resolve it based on your experiences.

After the do-release-upgrade crash, I repeated these commands:

sudo apt update && sudo apt upgrade
sudo apt full-upgrade
sudo apt autoremove

Until I had nothing else to upgrade.

I then invoked

sudo apt install --install-recommends linux-generic

but it had no effect (it was already installed I suppose)

Lastly, I invoked

sudo apt install ubuntu-gnome-desktop nvidia-driver-515

and that had quite a lot of to install. After installing that I repeated the full-upgrade/autoremove procedure

sudo apt update && sudo apt upgrade
sudo apt full-upgrade
sudo apt autoremove

and for good measure I also executed

sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf

It ended up booting fine, although many things were deleted in the upgrade (anthy, clang, dropbox ,etc. I ended up installing them manually). I think I have a working system now.