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How to fix `Error: unknown filesystem Entering rescue mode... grub rescue` on ubuntu 21.10

ve flag

I was working with my PC that it hanged and I pressed the Shut Down button until PC turned off. After that when I wanted to turn on the computer I got this error:

error: unkown filesystem Entering rescue mode... grub rescue>

I tried command ls resulting in:

(hd0) (hd0,msdos5) (hd0,msdos2) (hd0,msdos1)

and set prefix=(hd0,msdos1)/boot/grub the result was empty

Then I tried command insmod normal resulting in:

error: unknow filesystem

I tried to boot from USB, and got this error:

GRUB loading. Welcome to GRUB!
error: symbol 'grub_calloc' not found.
entering rescue mode...
grub rescue>

I have some important data on my PC.

Is there any way to fix the issue without losing data?

Update:

I boot Ubuntu20.04 with NTFS partition and then tried to live boot and this time ubuntu launched!

enter image description here

in flag
If you have your Ubuntu installation USB, you can boot and “Try Ubuntu”, then see if there’s a problem with the hard drive
Mahdi Jafari avatar
ve flag
Thanks, @matigo, I have updated the question and provided information.
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