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

[keepitsimpleengr]

This has worked previously.

root@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)

[keepitsimpleengr (keepitsimpleengineer)]

I ran os-prober in boot-repair on 10.4 LTS (1.38/Lucid) on the same computer, and it properly identified all linux system installed on the computer.

 Boot-info at ttp://paste.ubuntu.com/1101977/

[keepitsimpleengr (keepitsimpleengineer)]

Since grub2 in 10.04 LTS cannot use UUIDs, and my hardware BIOS mixes up hard-drive order from boot to boot, I found a workaround by installing grub2 in the third Linux system, Archlinux.

[keepitsimpleengr (keepitsimpleengineer)]

Notes on hardware: The disk that the undetected Linux distribution is on is connected to the system using a SATA-PCI interface card.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.