[Bug 674841] Re: os-prober 1.40 doesn't detect another ubuntu installation anymore

[bitinerant]

I, too, have "lost" my other Ubuntu partition.  I installed 12.04 on
sda1 using Btrfs; it booted fine.  Then I installed another 12.04 on
sda2 (/boot) and sda3 (swap) and sda4 (/), and it boots fine, but now I
can't boot from sda1.  Mounting and then unmounting sda1 as suggested in
comment #2 does not help.

$ sudo fdisk -l /dev/sda

Disk /dev/sda: 128.0 GB, 128035676160 bytes
255 heads, 63 sectors/track, 15566 cylinders, total 250069680 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00076ab2

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048    13672447     6835200   83  Linux
/dev/sda2   *    13672448    14258175      292864   83  Linux
/dev/sda3        14258176    24023039     4882432   82  Linux swap / Solaris
/dev/sda4        24023040   250068991   113022976   83  Linux
$ sudo os-prober 
$

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https://bugs.launchpad.net/bugs/674841

Title:
  os-prober 1.40 doesn't detect another ubuntu installation anymore

Status in “os-prober” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: os-prober

  On Natty development release, os-prober doesn't detect another Ubuntu
  installation on a separate partition, whereas previous maverick
  version does. It's clearly a regression.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: os-prober 1.40
  ProcVersionSignature: Ubuntu 2.6.36-1.7-generic-pae 2.6.36
  Uname: Linux 2.6.36-1-generic-pae i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  CheckboxSubmission: c4273c0f4f2b8d26cd6bf31cadfd2912
  CheckboxSystem: a871981cb5bdf4d6ebd55be46becf77e
  Date: Sat Nov 13 11:49:07 2010
  EcryptfsInUse: Yes
  ProcEnviron:
   SHELL=/bin/bash
   LANG=fr_FR.UTF-8
   LANGUAGE=fr_FR:fr:en_GB:en
  SourcePackage: os-prober

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