Ubuntu
grub2 package

grub-reboot does not select kernel

Bug #1102925 reported by Brian Candler
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
grub2 (Ubuntu)
Fix Released
Medium
Colin Watson

Bug Description

[Ubuntu 12.04.1 LTS server x86_64]

If I do

[code]
# vi /etc/default/grub
GRUB_DEFAULT="2>20"
# update-grub
[/code]

then I can select the default kernel to be used on next reboot.

However I believe it should be possible to do this in a one-shot way with grub-reboot, and this doesn't work.

[code]
# grub-reboot "2>20"
# cat /boot/grub/grubenv
# GRUB Environment Block
saved_entry=2>20
prev_saved_entry=0
################################
...
# reboot
[/code]

At reboot I just get the default kernel selected.

It doesn't appear to be anything to do with submenus[*] because "grub-reboot 1" doesn't even select the recovery option from the main menu.

[*] http://ubuntuforums.org/showthread.php?p=10720316

Related branches

lp:debian/experimental/grub2
Revision history for this message
Brian Candler (b-candler) wrote :

Having found
http://ubuntuforums.org/showthread.php?t=1428427
it looks like the pre-requisite is to configure

GRUB_DEFAULT=saved

There is a comment at the top of /etc/default/grub which refers the reader to info -f grub -n 'Simple configuration' where this is documented.

However it is not mentioned in the manpages of grub-reboot, grub-set-default or grub-editenv; I think it would be useful if it were.

Revision history for this message
Colin Watson (cjwatson) wrote :

Thanks for your report. I've committed a change upstream for 2.01 to document this:

2013-01-22 Colin Watson <email address hidden>

        * util/grub-reboot.in (usage): Document the need for
        GRUB_DEFAULT=saved.
        * util/grub-set-default.in (usage): Likewise.
        Reported by: Brian Candler. Fixes Ubuntu bug #1102925.

Changed in grub2 (Ubuntu):
assignee: nobody → Colin Watson (cjwatson)
importance: Undecided → Medium
status: New → In Progress
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package grub2 - 2.02~beta2-5

---------------
grub2 (2.02~beta2-5) experimental; urgency=medium

  * Add a number of EFI debugging commands to the signed image (lsefi,
    lsefimmap, lsefisystab, lssal).
  * Add gfxterm_background to the signed image so that background_image
    works in UEFI Secure Boot mode. Thanks to syscon-hh for the report.

 -- Colin Watson <email address hidden> Mon, 27 Jan 2014 10:03:00 +0000

Changed in grub2 (Ubuntu):
status: In Progress → Fix Released
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.