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I installed gentoo-2005.1 on my amd 64 pc and it worked well but
the performance was not so good so i tried to recompile my kernel
using genkernel and then when i rebooted i found the error
something like that root cant be mounted . I also have ubuntu amd windows xp installed on my pc . So then I started ubuntu and tried to mount root partition of gentoo but it could not be mounted and resulted
wrong fs type, bad option, bad superblock on /dev/hda8, missing
codepage or other error In some cases useful info is found in
syslog - try dmesg | tail or so
my /boot is in hda6 and root is /dev/hda8
and my grub.conf file is as below
title Gentoo Linux 2.6
# Partition where the kernel image (or operating system) is located
kernel /kernel-2.6.12-gentoo-r6 root=/dev/hda8
which one is your primary (most used distro)? Choose this one and mount each of the other two to /mnt (do this once or mount the second distro to something like /mnt/distro2 otherwise you'll get duplicate problems, etc.) Copy the kernels and the initrd (s) from each of these into the /boot directory of your preferred distro. This is where you should boot each of your Linuxes from, if you don't have a separate /boot. (I had the EXACT same problem lately and repartitioned my disk with shared /boot and shared /home, etc)
Now you'll have to debug the menu.lst entries in grub. You can either copy them from the other two distros into your preferred distro's menu.lst or try at boot time to manually edit the boot record. Option 2 would be easier in that if it fails at this stage, it's an awful lot faster just to power down and try again. The way you do this is when grub shows the menu (e.g. Gentoo, Ubuntu, GNU/Linux (that's Debian I take it??), Windows) go down to whatever one you wish to boot and press 'e' - which lets you edit in a console setting.
You will probably have to change the initrd to where it now resides at. If you let me know which distro you want as your preferred distro, I might be able to point yu in the right direction