Catatan dibawah ini saya sampaikan karena saya selalu mendapatkan masalah yang sama bila masing menggunakan 2 OS dilaptop. Dan selaaaluuu saja OS “Jendela” membuat ulah….virus lagi..virus lagi, dari pada capek ngurusin virus ya mending install ulang si “Jendela” ini.
1) Boot off the LiveCD
2) Open a Terminal and type in the following commands, noting that the first command will put you into the grub â€œpromptâ€, and the next 3 commands will be executed there. Also note that hd0,0 implies the first hard drive and the first partition on that drive, which is where you probably installed grub to during installation. If not, then adjust accordingly.
> root (hd0,0)
> setup (hd0)
Reboot (removing the livecd), and your boot menu should be back.
Only read below if Windows is now missing from the boot menu
If you installed Ubuntu before you installed Windows, then Ubuntu will not have anything in the grub configuration for Windows. This is where youâ€™ll have to do a bit of manual editing to the grub boot menu file.
If you open the file /boot/grub/menu.lst with the following command:
sudo gedit /boot/grub/menu.lst
Youâ€™ll see a sample section for Windows, which youâ€™ll want to uncomment and add to the boot menu list in whatever position you want it in. (uncomment by removing the #â€™s)
# title Windows 95/98/NT/2000
# root (hd0,0)
# chainloader +1
Note that you should also verify that hd0,0 is the correct location for Windows. If you had installed Windows on the 4th partition on the drive, then you should change it to (hd0,3)
Sumber : http://www.howtogeek.com/howto/ubuntu/reinstall-ubuntu-grub-bootloader-after-windows-wipes-it-out/