What if the Grub file recovery system is probably unknown?
Start by booting Ubuntu from an ISO image.
What if the Grub-Rescue filesystem is likely to be unknown?
What to do if Grub Shelter’s file system is unknown?
There is another reason for the problem. In this case, some GRUBs got corrupted in some way and had to be repaired and possibly reinstalled. However, as noted by Grub, registration with “Boot Repair” fails due to an unknown file system error, and the root partition where GRUB is installed can also get corrupted quite easily. To solve this problem:
What if the Grub-Rescue filesystem is unknown?
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What if the “Grub Preserve” file system is unknown?
Start by booting from Ubuntu into an ISO image.
What to do if the content of the Grub recovery file is unknown?
What if the Grub-Rescue file system is not immediately known?
There is another reason for this problem. In this particular case, GRUB was indeed corrupted in some way and needed to be installed or reinstalled permanently. However, as with the Grub rescue, if Boot Repair fails with an “unknown file system” error, it’s also possible that the root of your current partition where GRUB is installed is indeed corrupted. To solve this problem:
What to do if the file system for saving grub is unknown
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Related Cause “Grub-Rescue Unknown Manual Filesystem” The reason for this error is often because you didn’t usually remove the partition that has the second/duplicate operating system installed. For example, it could be a computer that both of you booted into between Windows and Linux. However, you have removed the Linux system from the partition.
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Welcome if you want GRUB! error: unknown filesystem Entering recovery mode Exiting the recovery shell usually means that experts claim that GRUB2 hasn’t loaded all the “normal” modules. Live CDs are good, but sometimes a proper first aid kit is almost necessary.
If you’re getting “error: unknown filesystem” it’s often not your Ubuntu partition. If this is an Ubuntu partition, you should see the Ubuntu folders including Lost+Found/, Home/, Boot/ and vmlinuz as well as initrd.img. First use this address as the target of the next command. mark vii (hdX,Y)/boot/grub – should show dozens of *.mod files.
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