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

[Steve Langasek]

** Package changed: grub (Ubuntu) => grub2 (Ubuntu)

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https://bugs.launchpad.net/bugs/1949490

Title:
  Grub doesn’t fully revert ZFS snapshots

Status in grub2 package in Ubuntu:
  New

Bug description:
  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.

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