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I have simple Windows 10 and Ubuntu installation. My latest Windows update just messed with my GRUB boot loader somehow.

Screenshot

Every other answer mentions to type a few

set boot

and

set prefix

However every time I get 'Filesystem is unknown', for every of the 4 partitions inside my hd0.

Any clues?

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As Greg Gómez states, a Live Ubuntu USB will allow you to download and install Boot Repair. Often, this GUI utility can remedy boot issues, so I've made a persistent boot USB with Boot Repair preinstalled for use after each Windows update mangles booting. N.B. Use the fastest flash USB drive you have for persistence, since the drive is accessed frequently (as opposed to an ordinary Live USB, in which much is moved to RAM).

If nothing else fixes the issue, make an image of the drive, reinstall Ubuntu using the existing partition, then copy back the ext4 Ubuntu partition.

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  • I understand your point however I cannot reinstall the whole system. I simply need to fix the MBR. My questions is how to approach this fix through GRUB Rescue only (no Windows recovery disk or Ubuntu recovery disk). – Daniel Santos Jun 22 '18 at 20:29
  • I am marking this a solution even if it was not what a looked for. Since I could not wait, I decided to move forward entering linux into live mode and I simply repaired GRUB inside the linux installation through GRUB repair. – Daniel Santos Jun 22 '18 at 20:30
  • @DanielSantos, well done... I'm glad grub repair worked. Since it's handy to have that and Boot Repair, I've made a Live Ubuntu with persistence and installed those to the USB drive. – DrMoishe Pippik Jun 22 '18 at 22:38
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It has been reported that upgrading Windows misconfigures the MBR partition tables, you might want to review these answers:

A plausible quick fix: reinstall or upgrade Ubuntu with an ISO/Live Image (Which is required if you're going the answers above) have work for me everytime I deleted partitions with diskmgnt (but as it is not your case might not solve the problem as well).

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  • I understand your point however I cannot reinstall the whole system. I simply need to fix the MBR. My questions is how to approach this fix through GRUB Rescue only (no Windows recovery disk or Ubuntu recovery disk). – Daniel Santos Jun 22 '18 at 20:28
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Ive had the same problem and fixed it using a live cd. I could see my ubuntu installed partition using lsblk, but the booted OS wouldn't use it. Here's the solution that worked for me:

-Booted from Ubuntu Live CD

-Opened terminal and tried to mount my ubuntu partition manually. Got error: “wrong fs type, bad option, bad superblock”

-Run fsck and say yes to everything

Try to mount it again. Should work. Also gpared won't show errors with it anymore. Reboot and done.

Additional info: You gotta make a mount folder for mounting, need root rights, etc. I used a Ubuntu 15 cd to repair Ubuntu 14.

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