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Old 07-21-2012, 05:45 AM   #1
sgamesk
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Post Can upgrading kernel cause grub breakdown in multi boot setup?


I have a multi boot set up with two Linux distributions and Windows. If I upgrade the kernel of one Linux distribution would it cause breakdown in grub boot selector for selecting which operating system I wish to boot? If this is right is there any solution for this?
 
Old 07-21-2012, 12:36 PM   #2
Roken
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Upgrading the kernel could break the grub loader for that OS, and, in limited circumstances, for another Linux OS in a multi-boot set up, but only if a set of conditions existed, those being:
  • That the kernel upgrade removed the old kernel and changed the name of the kernel image in /boot
  • That the kernel upgrade over-writes a kernel belonging to a different OS

Personally, whilst I have seen the first, a simple sudo update-grub would fix it. I have never seen the second. If you are multi-booting including Windows, your Windows boot entry shouldn't be affected at all.

A fix should be relatively easy, by booting a live CD, chroot into the OS owning grub and sudo update-grub. Alternatively, you could boot a live CD, mount /boot and manually fix /boot/grub/grub.cfg
 
Old 07-21-2012, 06:34 PM   #3
syg00
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Very unlikely.
Note that update-grub is not part of the grub[2] package, but likely will be available on Debian derived systems (certainly Ubuntu).
 
Old 07-21-2012, 08:00 PM   #4
Roken
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Personally, I use burg, which tends to mirror grub, and I've noticed that update-burg is no longer provided, but burg-mkconfig is. I assume that similar is available for grub.

Having said that, I've been maintaining burg.cfg (grub.cfg) manually for so long that I lose track.
 
Old 07-22-2012, 02:47 AM   #5
bsat
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Depends on how you updated the grub It could breakdown the grub if not done in the right way. Preferably use the tools that are available with the distro.
 
  


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