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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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