Public bug reported:
Also described here:
http://askubuntu.com/questions/271898/what-is-grub-doing-while-it-takes-9-minutes-to-start-booting-the-kernel
and here:
http://lists.gnu.org/archive/html/bug-grub/2013-03/msg00037.html
Sometime around the start of 2013 grub started to take longer and longer to
boot the kernel and kernel updates started taking too long (more than 10
minutes). The 30_os-prober process was seen executing. At one point grub was
taking 9 minutes to boot the kernel, which once booted just took 28 seconds to
boot. The delay was actualy in grub.
Later I discovered my /boot/grub/grub.cfg was 11.6 MB which is bad.
A big chunk of the menu entries is generated by /etc/grub.d/30_os-prober.
Line 223: ### BEGIN /etc/grub.d/30_os-prober ###
...
Line 175174: ### END /etc/grub.d/30_os-prober ###
grub.cfg has 175191 lines, so that script represents 99% of the 11.6 MB
in the file.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: os-prober 1.56ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
Uname: Linux 3.5.0-26-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
Date: Tue Apr 2 00:02:50 2013
InstallationDate: Installed on 2013-03-27 (6 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MarkForUpload: True
ProcEnviron:
LANGUAGE=es_AR:es
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=es_AR.UTF-8
SHELL=/bin/bash
SourcePackage: os-prober
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: os-prober (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal running-unity
** Attachment added: "Compressed 11.6 MB grub.cfg file"
https://bugs.launchpad.net/bugs/1163086/+attachment/3613357/+files/grub.cfg.bz2
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https://bugs.launchpad.net/bugs/1163086
Title:
os-prober created a 11.6 MB grub.cfg file impossible to boot
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