[Bug 1026774] [NEW] os-prober fails to detect a linux installation, no option in grub2 boot menu

[keepitsimpleengr]

Public bug reported:

This has worked previously.

root at 64bitWS:~# os-prober
/dev/sdb1:Windows NT/2000/XP (loader):Windows:chain
/dev/sdc1:Ubuntu 10.04.4 LTS (10.04):Ubuntu:linux
/dev/sdd1:Windows Vista (loader):Windows1:chain

misses /dev/sda2 arch linux

boot-info at http://paste.ubuntu.com/1099113/ and at
http://paste.ubuntu.com/1100049/

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: os-prober 1.51ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
Date: Thu Jul 19 12:32:04 2012
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: os-prober
UpgradeStatus: Upgraded to precise on 2012-06-15 (34 days ago)

** Affects: os-prober (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/1026774

Title:
  os-prober fails to detect a linux installation, no option in grub2
  boot menu

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

Bug description:
  This has worked previously.

  root at 64bitWS:~# os-prober
  /dev/sdb1:Windows NT/2000/XP (loader):Windows:chain
  /dev/sdc1:Ubuntu 10.04.4 LTS (10.04):Ubuntu:linux
  /dev/sdd1:Windows Vista (loader):Windows1:chain

  misses /dev/sda2 arch linux

  boot-info at http://paste.ubuntu.com/1099113/ and at
  http://paste.ubuntu.com/1100049/

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: os-prober 1.51ubuntu3
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: amd64
  Date: Thu Jul 19 12:32:04 2012
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: os-prober
  UpgradeStatus: Upgraded to precise on 2012-06-15 (34 days ago)

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