[Bug 1902483] [NEW] Sparse file not allowed (on btrfs), 20.04

[Alexey Boreyko]

Public bug reported:

Hello there.

I have just installed Ubuntu 20.04 on my PC with a single partition on
btrfs file system. There was no show any errors during installation.

When I rebooted, I got the legacy grub menu and when I select any option
of boot (either windows or ubuntu), I'm getting message:

error: sparse files not allowed. Press any key to continue.

I found some manaul and removed the following lines doing via that
manual:

recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi

So, when I removed these entries, the system booted just fine.

I have no idea why these two lines would cause a problem, but they appear to.
There already were same bugs, I've seen(one of them more than 9 years ago started (#464743 e.g.)).
Is it so hard to fix this?

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


** Tags: btrfs grub sparse

** Tags removed: file

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https://bugs.launchpad.net/bugs/1902483

Title:
  Sparse file not allowed (on btrfs), 20.04

Status in grub2 package in Ubuntu:
  New

Bug description:
  Hello there.

  I have just installed Ubuntu 20.04 on my PC with a single partition on
  btrfs file system. There was no show any errors during installation.

  When I rebooted, I got the legacy grub menu and when I select any
  option of boot (either windows or ubuntu), I'm getting message:

  error: sparse files not allowed. Press any key to continue.

  I found some manaul and removed the following lines doing via that
  manual:

  recordfail=1
  if [ -n ${have_grubenv} ]; then save_env recordfail; fi

  So, when I removed these entries, the system booted just fine.

  I have no idea why these two lines would cause a problem, but they appear to.
  There already were same bugs, I've seen(one of them more than 9 years ago started (#464743 e.g.)).
  Is it so hard to fix this?

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