Restoring MBR on Linux and Mac OS on eeePC

Bad things happens all at one go. My Mac OS crash on me and I am not able to recover from the B-Node problem.

Recover Grub2 for Ubuntu Karmic
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1. mount the harddisk consist of Ubuntu Karmic by clicking "Places -> XXGB File System"

2. open terminal and do a tail

mount | tail -1

3. You should see something similar

/dev/sda2 on /media/0d104aff-ec8c-44c8-b811-92b993823444 type ext4 (rw,nosuid,nodev,uhelper=devkit)

4. Check the boot partition by

ls /media/0d104aff-ec8c-44c8-b811-92b993823444/boot

You should see something similar

config-2.6.18-3-686 initrd.img-2.6.18-3-686.bak System.map-2.6.18-3-686
grub lost+found vmlinuz-2.6.18-3-686
initrd.img-2.6.18-3-686 memtest86+.bin

If this is wrong, then your partition is wrong.

5. Now everything is correct and is time to recover. Run the following to install GRUB into the correct directory and drive name.

sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444 /dev/sda

If you get BIOS warnings try:

sudo grub-install --root-directory=/media/0d104aff-ec8c-44c8-b811-92b993823444 /dev/sda --recheck

6. If all goes well, you should see the following.

Installation finished. No error reported.
This is the contents of the device map /boot/grub/device.map.
Check if this is correct or not. If any of the lines is incorrect,
fix it and re-run the script `grub-install'.

(hd0) /dev/sda

More information from below:

https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

Recover Boot Loader for Mac OS
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Give up. After googling for sometime, I cannot find any solution, might as well reinstall, since i have reinstall from the B-Node problem. Time is important now as I am rushing to complete my development.