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Re: managing a multiboot without stomping the toes of other OSes

From: Jordan Uggla
Subject: Re: managing a multiboot without stomping the toes of other OSes
Date: Mon, 17 Jan 2011 00:34:11 -0800

On Sun, Jan 16, 2011 at 11:58 PM, Rustom Mody <address@hidden> wrote:
> On Mon, Jan 17, 2011 at 1:13 PM, Jordan Uggla <address@hidden>
> wrote:
>> As for how you should set up your dedicated GRUB partition's grub.cfg
>> so that it can boot any of your installed distributions, the simplest
>> way is to use grub's "configfile" command. For example "search --set
>> --fs-uuid UUID_HERE; configfile /boot/grub/grub.cfg" will load that
>> distribution's grub menu, without chainloading. If for some reason you
>> feel the need to actually load the other distribution's GRUB, rather
>> than just its grub.cfg, you can do so (without unreliable blocklists)
>> by using multiboot to load GRUB's core.img from the filesystem rather
>> than chainloading a partition boot sector, for example "search --set
>> --fs-uuid UUID_HERE; multiboot /boot/grub/core.img"
> This is useful. I will try it and get back. (The laptop in question is not
> with me right now)
>> To keep Debian from overwriting the mbr (and thus your dedicated GRUB
>> installation) on upgrades of the grub-pc package, run
>> "dpkg-reconfigure grub-pc" and uncheck sda from the list of install
>> devices.
> Yeah sure -- when I do the reconfigure myself I know what to check and
> uncheck.
> The problem is that this can get fired during an upgrade which might be
> dealing with a hundred other packages, and a careless click here or there
> and my boot is screwed.

Running "dpkg-reconfigure grub-pc" will allow you to change what
device GRUB will be installed to when the grub-pc package is upgraded.
This value is saved and used for all future upgrades unless you
specify otherwise.

>> > 3. Please dont 'detect' other OSes
>> Add "GRUB_DISABLE_OS_PROBER=true" to /etc/default/grub
> Ok

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