Ubuntu
grub2 package

update-grub fails to find linux system

Bug #1026358 reported by keepitsimpleengr on 2012-07-18

This bug report is a duplicate of: Bug #1026774: os-prober fails to detect a linux installation, no option in grub2 boot menu. Edit Remove

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	grub2 (Ubuntu)	New	Undecided	Unassigned

Bug Description

After updating grub (sudo update-grub) from xubuntu 12.04 (Linux 3.2.0-26-generic #41-Ubuntu SMP Thu Jun 14 17:49:24 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux) on sdd to allow another system with a new kernel on another disk (sdg) to be booted, the boot menu ommitted the system on sdg.

This is new behavior. Prior update-grub executions listed the system on sdd.

Boot info script at http://paste.ubuntu.com/1099113/

:~$ apt-cache policy grub-pc
grub-pc:
  Installed: 1.99-21ubuntu3.1
  Candidate: 1.99-21ubuntu3.1
  Version table:
*** 1.99-21ubuntu3.1 0
        500 http://mirrors.us.kernel.org/ubuntu/ precise-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1.99-21ubuntu3 0
        500 http://mirrors.us.kernel.org/ubuntu/ precise/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: grub-pc 1.99-21ubuntu3.1
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: Wed Jul 18 15:10:50 2012
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: Upgraded to precise on 2012-06-15 (33 days ago)

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Revision history for this message

keepitsimpleengr (keepitsimpleengineer) wrote on 2012-07-18:

Dependencies.txt Edit (2.1 KiB, text/plain; charset="utf-8")

Revision history for this message

keepitsimpleengr (keepitsimpleengineer) wrote on 2012-07-19:

New boot info at http://paste.ubuntu.com/1100049/.

The system not booted (arch-linux) is reported as on sda in this report. It was reported on sdg in previous report.

This bootinfo reported this line not on previous:

"Linux not detected by os-prober on sda2. Please report this message to <email address hidden>"

Revision history for this message

YannUbuntu (yannubuntu) wrote on 2012-07-19:

Hello
- The change "sda -> sdg -> sdX" is not a problem, it is due to the BIOS.
- The message "Linux not detected by os-prober on sda2. Please report this message to <email address hidden>" is just informative.

The real bug is:
os-prober fails to detect the /boot partition of Arch in sda1.
As you say that Arch was correctly detected before doing update-grub, I think this is a regression of os-prober.

My 2 cents.