[Bug 970260] Re: Setting up memtest86+ hangs because of "grub-probe: error: unknown filesystem"

[Arthur Widetschek]

Ubuntu 13.04 Raring 64 Bit, btrfs
update-grub hangs at memtest86+
Ubuntu does not start.
My workaround: copied the old grub.cfg into /boot/grub/

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https://bugs.launchpad.net/bugs/970260

Title:
  Setting up memtest86+ hangs because of  "grub-probe: error: unknown
  filesystem"

Status in “grub2” package in Ubuntu:
  Fix Released
Status in “memtest86+” package in Ubuntu:
  Invalid
Status in “os-prober” package in Ubuntu:
  Fix Released
Status in “grub2” source package in Precise:
  Confirmed
Status in “memtest86+” source package in Precise:
  Confirmed
Status in “os-prober” source package in Precise:
  Confirmed
Status in “grub2” source package in Quantal:
  Fix Released
Status in “memtest86+” source package in Quantal:
  Invalid
Status in “os-prober” source package in Quantal:
  Fix Released
Status in “grub2” source package in Raring:
  Fix Released
Status in “memtest86+” source package in Raring:
  Invalid
Status in “os-prober” source package in Raring:
  Fix Released
Status in “grub2” package in Debian:
  Fix Released

Bug description:
  Installation of package memtest86+ fails, it does hang and never ends
  if lvm snapshot is present.

  Prepare:
  * create active lvm snapshot

  Test case:
  $ sudo apt-get install --reinstall memtest86+

  <hang>

  Recover from the hang with:
  $ sudo pkill -f 'frontend /var/lib/dpkg/info/memtest86\+.postinst'
  $ sudo killall grub-mount
  $ sudo umount /var/lib/os-prober/mount

  (don't kill grub-mount nor umount if you want the next run to
  "succeed", well not run)

  Actual problem:
  update-grub / os-prober leave stray grub-mount behing.
  workarounds applied in os-prober 1.57 doesn't actually help here.
  upgrading to quantal's grub2 package resolves the hangs.
  A minimal backport from grub has not been identified yet.

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