[Bug 1949490] [NEW] Grub doesn’t fully revert ZFS snapshots

[Launchpad Bug Tracker]

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To reproduce this bug, take the following steps

Install Ubuntu 20.04.3 using a ZFS-based root.
Boot into it and get past the initial startup screens.
Take a manual recursive zfs snapshot like so

zfs snapshot -r rpool at beforeanything

Now touch a file on the desktop and install a package like htop.

You should see the file and htop should be able to run.

Reboot and hit escape to enter the grub screen. Choose the history menu
and choose the snapshot you just created. Then hit enter and then choose
the option to revert system and user data and then enter again.

If it were working correctly, everything should be reverted. There’d be
no file on the desktop and no trace of htop.

That’s not what occurs. The file on the desktop is still there, and
while htop is no longer installed, the package management seems to think
it is.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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Grub doesn’t fully revert ZFS snapshots
https://bugs.launchpad.net/bugs/1949490
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