[Bug 1203348] Re: update-grub takes ages with Fedora installed alongside Ubuntu

[František Zatloukal]

Without Fedora: 4s
With Fedora: 252s

After 4 seconds, I've got this output
Generating grub.cfg ...
Found linux image: /boot/vmlinuz-3.10.0-4-generic
Found initrd image: /boot/initrd.img-3.10.0-4-generic
Found linux image: /boot/vmlinuz-3.10.0-2-generic
Found initrd image: /boot/initrd.img-3.10.0-2-generic
Found linux image: /boot/vmlinuz-3.10.0-1-generic
Found initrd image: /boot/initrd.img-3.10.0-1-generic
Found memtest86+ image: /boot/memtest86+.bin

and after 252 seconds
Found Fedora release 20 (Rawhide) on /dev/sda3
done

Situation is same with Ubuntu 13.04 and Fedora 19. It's single core Intel Atom CPU (with HT), 2GB RAM and classic HDD. 
I can do further testing on different machines if necessary.

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https://bugs.launchpad.net/bugs/1203348

Title:
  update-grub takes ages with Fedora installed alongside Ubuntu

Status in “grub2” package in Ubuntu:
  Incomplete

Bug description:
  update-grub command (which is executed after every kernel update)
  takes so long with both Ubuntu and Fedora installed on same machine.
  Since grub can't be removed because of some dependencies in kernel
  package it is very annoying.

  My HDD partitions:
  Device Boot   Begin       End    Blocks    Id  System
  /dev/sda1   *        2048     2050047     1024000   83  Linux
  /dev/sda2         2050048   253708287   125829120   83  Linux
  /dev/sda3       253708288   357541887    51916800   83  Linux
  /dev/sda4       357543934   488396799    65426433    5  Extended
  /dev/sda5       480204800   488396799     4096000   82  Linux swap/Solaris
  /dev/sda6       357543936   480204799    61330432   83  Linux

  /dev/sda1 is /boot of Fedora
  /dev/sda2 is / of Fedora
  /dev/sda3 is /home of Fedora
  /dev/sda4 is extended partition containing Ubuntu

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: grub2 2.00-15ubuntu2
  ProcVersionSignature: Ubuntu 3.10.0-2.11-generic 3.10.0
  Uname: Linux 3.10.0-2-generic x86_64
  ApportVersion: 2.11-0ubuntu1
  Architecture: amd64
  Date: Sat Jul 20 19:11:43 2013
  InstallationDate: Installed on 2013-07-07 (12 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130701)
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=cs
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=cs_CZ.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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