[Bug 990628] Re: 10.04.3 -> 12.04 install hangs, grub won't boot. memtest86+ culprit

[Paul Adler]

*** This bug is a duplicate of bug 970260 ***
    https://bugs.launchpad.net/bugs/970260

** This bug has been marked a duplicate of bug 970260
   Setting up memtest86+ hangs because of  "grub-probe: error: unknown filesystem"

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https://bugs.launchpad.net/bugs/990628

Title:
  10.04.3 -> 12.04 install hangs, grub won't boot.  memtest86+ culprit

Status in “memtest86+” package in Ubuntu:
  New

Bug description:
  During the 10.04.03 -> 12.04 upgrade, the install hung.

  I logged in and checked the process tree for the precise installer,
  and saw that the memtest86+.post process was defunct and unresponsive
  to all kill signals.  I had to kill the frontend process to continue
  the install.

  
  pstree -p 8126
  precise(8126)─┬─precise(9103)───dpkg(20835)───frontend(22585)─┬─memtest86+.post(22599)
                │                                               ├─{frontend}(22592)
                │                                               └─{frontend}(22594)
                ├─sh(14888)───sleep(23516)
                ├─{precise}(8386)
                ├─{precise}(8387)
                └─{precise}(14907)

   ps -ef|grep 22599
  root     22599 22585  0 00:22 pts/3    00:00:00 [memtest86+.post] <defunct>

  
  grub produced an error, but I couldn't re-run grub from the command line while the install was running since it claimed that grub was not installed.

  After the install completed, grub would not boot and dropped into the
  grub recover console.  I had to boot up the live CD  in recover mode
  and issue a "grub-install /dev/sda" to get the system to recover.

  Once it booted, the same defunct memcheck86+.post process occurred
  every time I attempted to rebuild grub.  Removing the memcheck86+
  package (apt-get remove memcheck86+) let grub finish and now the
  system boots again without a problem.

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