grub2

milomak · 06-09-2009, 04:27 PM

I am currently running Debian Sid with Grub2 as my main OS. What is happening is that grub2 is picking up the Debian kernels, but not Gentoo nor Windows?

I tried to edit the /boot/grub/grub.cfg but on an update-grub2 those entries would be deleted. I then noticed the file actually says not to edit it.

I have had a look at the files in /etc/grub.d/ but they do not help me in sorting out how I would add an entry like the below permanently

Code:

menuentry "Gentoo" {
set root=hd(0,6)
chainloader +1
}

In desperation I even tried adding the below to /boot/grub/grub.cfg

Code:

### BEGIN /etc/grub.d/50_personal ###
### END /etc/grub.d/50_personal ###

And then setting that file as follows (and ran chmod a+x):

Code:

debian:/etc/grub.d# cat 50_personal 
echo 'menuentry "Gentoo Linux" {' >> /boot/grub/grub.cfg
echo '	set root=(hd0,6)' >> /boot/grub/grub.cfg
echo '	chainloader +1' >> /boot/grub/grub.cfg
echo '}' >> /boot/grub/grub.cfg

I originally tried it without the echo commands.

aus9 · 06-09-2009, 08:03 PM

hi

try running update-grub with root powers and recheck your grub.cfg....this runs all scripts you have modded in /etc/grub,d/

I assume you know how to make backups if not...you may need to read the rest of my wiki from the link below.

----

if no joy you can edit manually as a last resort

http://www.sidux.com/index.php?modul...tag=Grub2chain

milomak · 06-10-2009, 02:31 PM

The /etc/grub.d/50_personal should look like this

Code:

#!/bin/sh
cat << EOF
menuentry "Gentoo Linux" {
  set root=(hd0,11)
  chainloader +1
}
EOF

aus9 · 06-12-2009, 08:00 PM

hi

I have only played with some stuff in vbox as I have only one system partition and if I change distros...it will overwrite there.

I am wondering if you have tried something easier?....to use the os prober function...I am now thinking it needs to find bootable partitions.

2) If you have the time to test, run a live cd and run gparted or some other partition tool and mod your Gentoo partition to make it bootable.
then boot back into sid or whatever your grub2 is on...and run update-grub...(after making a backup of course)...and see if the script for os prober worked and grub.cfg has changed?

3) if you feel like doing this....and it is confirmed....I will edit my wiki and give you credit.

regards

EDIT

4) if not gparted...fdisk /dev/sdX...x likely to be a
press m for help and a is the bootable command

milomak · 06-17-2009, 03:09 PM

I normally run multiple OSes with one designated as my main OS (for the last 3-4 years this has been Debian). Every other OS I intsall I then install grub to that partition. I do this so when I change kernels and the like the grub for that distro does its business without issue.

So in the Debian grub, I need to have entries that point to the partition of the other OSes using chainloader. I used osprober a couple of times but it didn't pick up all my OSes.

billymayday · 06-17-2009, 05:56 PM

Is "set" a valid grub command? Normally you'd just have "root (hd0,0)" or similar, no "=" no set. Could be a grub2 thing.

aus9 · 06-17-2009, 07:39 PM

billymayday

yep other than my link to the chainloader....set stuff other examples of set and = are shown here

http://www.sidux.com/index.php?modul...a&tag=Grub2cfg

http://www.sidux.com/index.php?modul...a&tag=grub2bak

this is because grub2 is configured by scripts.

billymayday · 06-17-2009, 07:51 PM

Makes sense - wasn't sure, but I thought it worth raising just in case.