Hi, boot from Ubuntu Live CD/usb..
so.. execute in terminal
sudo fdisk -l
attach result here plz
I think firstly you had problem in grub.cfg
probably UUID of one of bootable devices was changed..
So now you have broken mbr(
but anyways show result of fdisk -l
before you try to repair GRUB)
so how to repair GRUB
..
Boot from Ubuntu Live CD/usb
then
cd /media
sudo mkdir salvation
sudo fdisk -l
then you have to find your linux partition..
something like /dev/sda1 or sda2 or sda3 or ...
)
all depends from quantity of your real disk and partitions on it
mmmm let's name it for exapmle sdXY ( where X 's number of physical disk, Y 's number of partition on it)
then you have to do next thing
sudo mount /dev/sdXY /media/salvation
sudo mount --bind /dev /media/salvation/dev
sudo mount --bind /proc /media/salvation/proc
sudo chroot /media/salvation
then you can edit mtab and grub.cfg (because I think you grub couldn't find some bootable partition
)
then ...
sudo grub-install /dev/sdX
reboot and FUN
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