[Bug 1939370] Re: update-grub is not detecting prior QA-test install (likely b/c BTRFS)

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This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1939370

** Tags added: iso-testing

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Title:
  update-grub is not detecting prior QA-test install (likely b/c BTRFS)

Status in grub2 package in Ubuntu:
  New

Bug description:
  lubuntu 20.04.3 QA-test install on
  - hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

  ** Summary

  update-grub is not detecting prior QA-test install; grub is only
  offering new install as boot option

  Two installs were performed on this box
  (1) Manual partition; two partitions / (btrfs) & /home (ext4)
  (2) Install alongside; the /home was selected to be split

  ** Expected Results

  I expect a new install to show two choices in grub
  - (L)ubuntu 20.04.3 (first install)
  - (L)ubuntu 20.04.3 (this new install which was an 'install alongside'

  ** Actual Results

  First login (of new install) and I ran `sudo update-grub` (after
  copying first grub.cfg to grub.cfg.org) and `diff` shows only

  guiverc at dc7700:/boot/grub$ diff grub.cfg grub.cfg.org
  103c103
  <   set lang=en_AU
  ---
  >   set lang=C

  so one first boot into new system, I get the same result as it did
  during install.  (the `diff` results could be common, or a result of
  me not having the ethernet cable in box at time calamares was started
  for first install; prior install was no-internet so cable had been
  removed)

  Using `pcmanfm-qt` to mount partitions and re-run `update-grub` &
  `diff` with & same answers.

  ** Likely Cause

  The prior install was a BRTFS "/" partition which is likely cause.  It
  likely won't impact many users, in fact when navigating there in
  `pcmanfm-qt` I get a "@" directory before I see the actual real "/"

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: grub2-common 2.04-1ubuntu26.12
  ProcVersionSignature: Ubuntu 5.11.0-25.27~20.04.1-generic 5.11.22
  Uname: Linux 5.11.0-25-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Tue Aug 10 15:44:18 2021
  InstallationDate: Installed on 2021-08-10 (0 days ago)
  InstallationMedia: Lubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210809)
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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