Public bug reported:

I had a 20.04 system I "upgraded" to 22.04.

> do-release-upgrade -d

The upgrade went well except after reboot the system never came back up.

Searching the web I found quite a few others having the same/similar
problem.

Troubleshooting

I booted a LiveCD Ubuntu 22.04 and looked at /boot on the just upgraded
system and found something really strange!

There were the expected vmlinuz and initrd files

but there were also 2 entries for some kind of KVM entries ??

Removing the KVM entries and rebooting the system it rebooted
successfully into 22.04.

I'd never seen "KVM anything" in grub boot menu before so thought I'd
report it.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1971573

Title:
  After upgrade from 20.04 to 22.04 & reboor hangs

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