Mailinglist Archive: opensuse (1231 mails)

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Re: [opensuse] Grub2 and installing multiple distros on same computer - *ADDENDUM*
On 09/03/13 00:09, Carlos E. R. wrote:
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El 2013-03-04 a las 14:50 +1100, Basil Chupin escribió:

Following the above I installed os 12.3 RC2. All went well and I could booth into either 12.2 or 12.3 -- but with some "fiddling" re booting into 12.2 because I upgraded the kernel in 12.2 from 3.8.1-1 to 3.8.1-2 but this new kernel was not being recognised at boot time (details about this on request, if you want to know about this).

I installed RC2 a few days back, using grub2, as a secondary system on this laptop. I read no guide, just used common sense and Yast (and a full image backup).

What I did was tell yast to install grub 2 on the partition dedicated to RC2, and to not write anything to the MBR (which it will do by default). I may have forgotten another click by now. Ah! Yes, it also wanted to change some bootable marks which I disabled.

Yes, this is correct: you install the bootloaders of the OSs in the ROOT directory of the OS being installed and do not allow the MBR to be written to EXCEPT by the FIRST operating system you install - which is then overwritten when you install the 'Master' bootloader (as I have) . (But there is another exception which is that if you also have Windows then it will write its loader in the MBR which is why one installs Windows first and then the Linux install of the first distro will overwrite the MBR.)

It's a bit difficult to explain all this in a few words :-( .

But what you did is OK when you only have 2 OSs installed but then things get a bit difficult if you install more or change them or remove them - which is why the "main" booloader is suggested. For example, if you have 4 OSs installed and don't have a "main" loader then you would need to run grub2-mkconfig on each of the OSs whenever you add another or remove one of them; whereas if you have a "main" loader then you only have to run grub2-mkconfig just the once fot this mail loader.


Piece of cake :-)

Always is - when you know how :-) .


Of course, my main system (see sig below) uses grub 1 and has an entry that points to the test partition, which now starts grub2.

Yep, no worries here. But what will happen if you decide to add 12.3 or Ubuntu/Kubuntu or Debian or <whatever> ? :-)

(Just on this point: I had 11.x installed a while ago and then installed Ubuntu. I couldn't understand what the fuss was all about re bootloaders and grub2 vs grub and "main" bootloaders - afterall, 11.x was working fine and so was Ubuntu! What was all the fuss about? I thought. Well, I found out later why a "main" loader is most useful - and so easy to setup.

BC

--
Using openSUSE 12.2 x86_64 KDE 4.10.1 & kernel 3.8.2-1 on a system with-
AMD FX 8-core 3.6/4.2GHz processor
16GB PC14900/1866MHz Quad Channel Corsair "Vengeance" RAM
Gigabyte AMD3+ m/board; Gigabyte nVidia GTX550Ti 1GB DDR5 GPU


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