Unknown filesystem grub rescue> Error ubuntu

when computer shows Unknown filesystem grub rescue> on starting ubuntu do these things to recover

---. Boot your computer on a ubuntu live-CD or live-USB

---choose option "Try ubuntu without installation"

---Install Boot Repair

- open terminal then type

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

-press enter then type

sudo apt-get install -y boot-repair && boot-repair

----if you can't install Boot Repair from repository, dowload it from official

website of Boot Repair

---After Installing open it and click the "Recommended repair" button .

this will fix your system

---Reboot your system it will work fine

if your system is not fixed after this do the following(you have to install grub)

--- If your linux partition is in sda10

sudo mount /dev/sda10 /mnt sudo mount --bind /dev /mnt/dev sudo mount --bind /sys /mnt/sys sudo mount --bind /proc /mnt/proc

sudo chroot /mnt(this show #)

sudo update-grub

grub-install /dev/sda

exit

sudo umount /mnt/dev

sudo umount /mnt/sys

sudo umount /mnt/proc

sudo umount /mnt/

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