[Merge] ~jchittum/livecd-rootfs:jammy-revert-5ac4df3a into livecd-rootfs:ubuntu/jammy

[Steve Langasek]

Review: Disapprove

This is still wrong wrt the upgrading of the bootloader on disk post-install, and https://bugs.launchpad.net/cloud-images/+bug/2034253/comments/5 gets to the bottom of why it's unbootable.  Let's fix that instead (grub2 SRU?)
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https://code.launchpad.net/~jchittum/livecd-rootfs/+git/livecd-rootfs/+merge/450811
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