Today we discuss the most frustrating error which is called Grub Rescue unknown filesystem Command Ubuntu error. We see this error on Ubuntu, Kali Linux, CentOS, Rethat, Blackbox os etc. This is really very hard to resolve and sometimes its better for format and reinstall the OS again. People search on google to solve this error.

Below is Step by step process of Grub Rescue unknown filesystem Command Ubuntu error (100% working)
Step 1: Type ls to find out all the partitions on HDD/SSD
#grub> ls
result will be similar as shown below
(hd0), (hd0,msdos1),(hd0,msdos2),(hd0,msdos2),(hd0,msdos3)
Step 2: check on which partition file system exist
#ls (hd0, msdos1)
if it found file system it will show result
ext4: file system
otherwise it will show error
no file system found
check all partition until we find file system
Step 3: set the boot on that partition
grub>set boot=(hd0,msdos1)
OR
grub>set root=(hda0,msdos1)
Step 4: Set prefix
grub> set prefix=(hd0,msdos1)/boot/grub
OR
grub> set prefix=(hd0,msdos2)/boot/grub/
Step 5: insmod normal
grub>insmod normal
grub>normal
if i386-pc file not found on this path
(ls (hd0,msdos2)/boot/grub/
then we have to copy from
(hd0,msdos2)/usr/bin/grub/
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