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<H1>[Mageia-dev] Grub and Grub2</H1>
<B>andre999</B>
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TITLE="[Mageia-dev] Grub and Grub2">andre999mga at laposte.net
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<I>Sat Feb 4 10:32:45 CET 2012</I>
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<PRE>Michel Catudal a écrit :
><i> Le 03/02/2012 19:05, Pierre Jarillon a écrit :
</I>>><i> I have installed Mageia on a disk after Ubuntu.
</I>>><i> After the install, I reboot and Ubuntu was ignored in Grub.
</I>>><i> The owner of the PC was not happy and tought that Mageia is bad.
</I>>><i>
</I>>><i> I have not found how to restore an access to Ubuntu and after an
</I>>><i> hour, I have
</I>>><i> reinstalled Ubuntu which install its grub2 allowing to boot on both
</I>>><i> systems.
</I>>><i>
</I>>><i> In Caudron, grub2 is not still used. Is time to switch to Grub2 ?
</I>>><i>
</I>><i>
</I>><i> I have installed both ubuntu and mageia with no problem with regard to
</I>><i> booting ubuntu.
</I>><i> You must have left ubuntu put the bootloader on the MBR. If you are
</I>><i> going to install several Linux distribution you should install the OS
</I>><i> on partitions and not on the MBR.
</I>><i>
</I>><i> On my PC I use xosl as a bootloader and always install grub on the
</I>><i> boot partition. A few years back I got burned when I forgot to change
</I>><i> the default.
</I>><i> One thing that pisses me off on all the Linux distribution, including
</I>><i> Mageia is that the fact that the bootloader is on the MBR is sorta
</I>><i> hidden and it is not obvious how to switch it to the partition. It
</I>><i> should be on the top with boxes with the choice of where we want it
</I>><i> and a message that is not cryptic and makes it obvious what that does.
</I>><i> That way I don't see where we could accidentaly screw up our system.
</I>><i> There is no problem if you have only one operating system to have grub
</I>><i> on the MBR but brain dead to put it there when you have several OS.
</I>><i> Specially when you have diffferent incompatible versions of grub.
</I>><i>
</I>><i> The way I recovered the messed up boot was to boot on my xosl boot
</I>><i> diskette and restore its boot.
</I>><i>
</I>><i> Here is the layout of one of my hard disks.
</I>><i>
</I>><i> Périphérique Amorce Début Fin Blocs Id Système
</I>><i> /dev/sda1 1 1 8001 78 Inconnu <-- xosl
</I>><i> /dev/sda2 2 261 2088450 6 FAT16 <-- Free
</I>><i> Dos
</I>><i> /dev/sda3 * 262 276 120487+ 83 Linux
</I>><i> /dev/sda4 277 243201 1951295062+ 5 Etendue
</I>><i> /dev/sda5 277 750 3807373+ 82 Linux swap /
</I>><i> Solaris
</I>><i> /dev/sda6 751 765 120456 83 Linux
</I>><i> /dev/sda7 766 780 120456 83 Linux
</I>><i> /dev/sda8 781 795 120456 83 Linux
</I>><i> /dev/sda9 796 60000 475564131 83 Linux
</I>><i> /dev/sda10 60001 120000 481949968+ 83 Linux
</I>><i> /dev/sda11 120001 160000 321299968+ 83 Linux
</I>><i> /dev/sda12 160001 200000 321299968+ 83 Linux
</I>><i> /dev/sda13 200001 243201 347012001 83 Linux
</I>><i>
</I>><i>
</I>><i> Michel
</I>><i>
</I>So the key point seems to be a separate boot partition, which links to
the root partitions of the different systems, which each have their
system-specific boot loaders.
That could probably be done with grub without too much problem, if it
can't be installed like that already.
(The initial boot step simply chain-loading to whatever system, as it
already does with ms-based systems.)
Sounds like a lot more stable approach. And it shouldn't take any
longer to boot to Linux.
Or maybe we should package xosl ?
--
André
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