How to fix 'error: unknown filesystem. grub rescue'
This tutorial will show you step by step how to fix the 'error: unknown filesystem. grub rescue' problem in Ubuntu and Linux Mint.
Do you get the 'error: unknown filesystem. grub rescue>' error message when you start your computer?
This tutorial will show you how to fix this problem by repairing grub in Linux Mint and Ubuntu.
How to repair GRUB
error: unknown filesystem.
grub rescue>
-
Type the following command:
ls
- Press the Enter key on your keyboard.
This command will show all the partitions on your hard drive.
Example 1:
grub rescue> ls (hd0) (hd0,gpt5) (hd0,gpt4) (hd0,gpt3) (hd0,gpt2) (hd0,gpt1) (fd0) grub rescue>
Example 2:
grub rescue> ls (hd0) (hd0,msdos5) (hd0,msdos4) (hd0,msdos3) (hd0,msdos2) (hd0,msdos1) (fd0) grub rescue>
-
To find the partition where Linux Mint or Ubuntu is installed, type the following command:
ls (hd0,...)
- Press Enter.
Do this for every partition until you see something, like:
grub rescue> ls (hd0,gpt5)/./ ../ lost+found/ etc/ media/ bin/ boot/ dev/ home/ lib/ mnt/ opt/ proc/ root/ run/ sbin/ selinux/ srv/ sys/ tmp/ usr/ var/ initrd.img initrd.img.old vmlinuz cdrom/ grub rescue>
In my example is (hd0,gpt5) the correct partition and I'll be using this partition as an example in the following steps, so don't forget to replace gpt5 with your partition.
-
Type the command below but replace gpt5 with your partition.
set prefix=(hd0,gpt5)/boot/grub
- Press Enter.
-
Type the command below but replace gpt5 with your partition.
set root=(hd0,gpt5)
- Press Enter.
-
Type the following command:
ls /
- Press Enter.
-
Type the following command:
insmod normal
- Press Enter.
-
Type the following command:
normal
- Press Enter.
- The Grub will now open a boot menu and display all installed operating systems. Boot into Linux Mint or Ubuntu.
- Open a Terminal window.
-
Type the following command:
sudo update-grub
- Press Enter.
-
Type the following command:
sudo grub-install /dev/sda
- Press Enter.
- Close the Terminal window.
This solution fixed my problem.