Dual-Boot and Grub 2 problems fix
If
you are struggling with dual-boot problems and Grub 2 this may help.
1)
Boot from cd or flash drive with
the same architechture ie.
32 or 64-bit as your missing o/s
2)
Get to a root console prompt
3)
type: blkid
this
gives you a listing of all your partitions with newer sata drive
hardware
or
type : fdisk
-l
for
older ata style machines.
4)locate
the operating system partition eg. sda1 sdb2 sdc3 etc.
5)
mount this partition type: mount
/dev/sd** /mnt
(**
whatever partition your o/s is on - discovered from the blkid
command)
6)
Create a chroot environment,
type:
mount
--bind
/dev /mnt/dev
mount
--bind
/dev/pts /mnt/dev/pts
mount
--bind
/sys /mnt/sys
mount
--bind
/proc /mnt/proc
7)
type: chroot
/mnt
you
are now using your previously unbootable operating system.
8)
type: grub-install
/dev/sd*
(*
whatever drive - not
the partition your
o/s is on - discovered from the blkid command eg. /dev/sda)
9)type: update-grub
this
should list all the o/s's grub can find and install to the mbr
(master boot record) of the boot drive.
10
type: cntl+d
(control
key and letter d) this exits the chroot environment and brings you
back to the cd/flash drive system
11)
exit gracefully by unmounting type: umount
/mnt/dev/pts
umount
/mnt/dev
umount
/mnt/sys
umount
/mnt/proc
umount
/mnt
12)
reboot
