[SOLVED] sabayon fried my bootloader

[Chymera]

ok, so i wanted to install sabayon on my "safe" pc (the one i dont experiment on), figuring that i know how to use sabayon well enough to stay clear of any trouble...

WRONG!
During the installation i added my ubuntu as my default boot option, and probably got the path wrong or something like that; since booting sabayon works fine, but booting ubuntu gives the following output:

rootnoverify (hd0,1)
chainloader +1
Error 13: Invalid or unsupported executable format

My ubuntu installation is still intact, so the bootloader is the only problem. I just followed a guide from the forums on how to reinstall your grub from a livecd, and guess what, nothin happened.

[rsambuca]

You need a line that says 'title' above the root line. You probably don't need the rootnoverify either. I just use root for chainloading distros.

[Chymera]

say what?

..... so what exactly should i do to get this up and running again, i know how to edit the sabayon grub entries.... but didnt quite understand what you said i should add

[rsambuca]

OK, post your grub.conf and we'll figure it out.

[Chymera]

voilà

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,2)
# kernel /boot/kernel-genkernel real_root=UUID=cdab712a-5058-4f37-b7c5-8128e5047950
# initrd /boot/initramfs-genkernel
#boot=sda
default=1
timeout=6
splashimage=(hd0,2)/boot/grub/splash.xpm.gz
title Sabayon Linux x86-64 3.4
root (hd0,2)
kernel /boot/kernel-genkernel-x86_64-2.6.22-sabayon root=/dev/ram0 ramdisk=8192 real_root=UUID=cdab712a-5058-4f37-b7c5-8128e5047950 quiet init=/linuxrc splash=silent,theme:sabayon vga=791 CONSOLE=/dev/tty1 pci=nomsi
initrd /boot/initramfs-genkernel-x86_64-2.6.22-sabayon
title Ubuntu
rootnoverify (hd0,1)
chainloader +1
title Other
rootnoverify (hd1,0)
chainloader +1

[Chymera]

soooo....?

[yabbadabbadont]

Do you plan to keep using Sabayon on that machine? If so, boot Sabayon then mount your ubuntu partition. Look at the menu.lst in the boot/grub directory of your mounted ubuntu partition. Copy the first entry from that file and add it to your grub.conf (or menu.lst whichever sabayon uses) in your Sabayon's /boot/grub directory.

If you don't wish to keep Sabayon, post the output of running "fdisk -l" and tell us which of the listed partitions contains your ubuntu system.

[floke]

In Sabayon, or a live CD, mount your ubuntu partition and copy the grub/menu.lst part over to your Sabayon grub file.

eg:

1) mkdir /home/yourname/Desktop/here
2) sudo mount /dev/hda2 /home/yourname/Desktop/here

Then scoot through the 'here' folder to the /boot/grub/menu.lst file -- and copy the relevant stanza over.

[Kingsley]

Try changing the Ubuntu section to this:

title           Ubuntu, kernel 2.6.20-16-generic
root            (hd0,1)
kernel          /boot/vmlinuz-2.6.20-16-generic root=UUID=cdab712a-5058-4f37-b7c5-8128e5047950 ro quiet splash
initrd          /boot/initrd.img-2.6.20-16-generic
savedefault

Make sure you save backups of Grub before you take anyone's advice.

[Chymera]

ok hope this works....