If you get an “error: unknown filesystem” this is not your Ubuntu partition. If this is the Ubuntu partition, you will see the Ubuntu folders, including lost+found/, home/, boot/ and vmlinuz and initrd.img. Use this address as the first part of the next command. ls (hdX,Y)/boot/grub – should display several dozen *.mod files.
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Resizing/merging/splitting partitions.
Reinstall the Ubuntu operating system.
Restore your Ubuntu operating system to an older version.
Case 1: when deleting an Ubuntu/Linux partition.
Repair MBR with MiniTool Partition Wizard.
Repair BCD with Windows 10 Automatic Repair Files.
Boot Windows 10 according to the installation media and select the “Repair your computer” option.
Click on the “Troubleshoot” situation and select “System Restore” to restore it to the point you set earlier.
You also do a trial run in “Auto Repair”.
Download the live Linux installer.
Use a tool like Etcher to write the Linux look and feel to an SD card or a good USB drive.
Insert a bootable smartphone and start the computer. Try
Select Ubuntu on the main screen.
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Start Windows. Start your computer and select the Windows operating system that comes from the bootloader.
Remove the Linux disk. Right-click the Start button and select Data Management.
Allocate unallocated space for Windows 10.
Open the online launch alert command.
ICBM repair.
boat repair.
Scan Windows hard drives.
Restore BCD.
If you’re still getting errors: new filesystem, then go back to a few grub settings, there if grub-rescue > dedicated key, that means I’d say the partition settings are correct, then the regular key.
Start by booting Ubuntu from an ISO image.
What if the Grub-Rescue filesystem is unknown?
What to do if the recovery file system is unknown?
What to do if the Grub file recovery system is unknown?
There is another reason for this problem. In this particular case, Grub was somehow broken and needed to be fixed or possibly reinstalled. However, as Rescue Grub mentioned it failed with a “Boot Repair” consisting of an unknown file system error, it’s possible that the root partition where GRUB is installed is usually corrupted. To solve this problem:
What if the complete Grub Rescue system is unknown?
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