How to fix GRUB unknown filesystem error

This is yet another “geeky” post from someone who has been writing a lot about Hyderabad and its delicacies for quite sometime now. But then again, I write a post usually when I come across some new, weird, or exciting experience and the one I had right now(rather I’m having one) is while installing Windows 10 Technical Preview – 64bit on my tiny little HP Mini.

Most of us are aware that the tech giant has already released a technical preview for all the customers world wide – obviously stating the risks involved while installing it on your systems – but nevertheless, I got my hands on this one too.

Before I begin, here’s some background info that got me to this error. First of AL, my HP mini has a GRUB boot loader that allows me to choose my OS: Ubuntu or Windows 7.I created a new partition on my hard disk using a partition manager tool. The moment I restarted the PC, the GRUB gave me the following error – GRUB ERROR – UNKNOWN FILESYSTEM and didn’t agree to even boot further !

To overcome this, in the GRUB CLI(Command Line Interface) do the following in order:

  1. Type ls in the command line. This will give you a list of partitions present on your system. It would give a list like (hd0,msdos1), (hd0,msdos2) and so on.
  2. Now comes the tedious part. Type ls the partition name followed by a forward slash ‘/’ Eg.: ls (hd0,msdos1)/
  3. The above line will given you unknown filesystem error. But for any one of those it will say something like lost+found along with other folder names.
  4. Once you get the above line, note down the partition name. Let’s assume (hd0,msdos5) for example.
  5. Now type set root=(hd0,msdos5)/
  6. Type set prefix=(hd0,msdos5)/boot/grub
  7. Type insmod normal
  8. Type normal
GRUB Error CLI mode.
GRUB Error CLI mode.


If all the steps are followed correctly, the system will reboot and you should get your familiar GRUB Bootloader back as before.

So, I guess his post is helpful for many of you as this was helpful for me too. One of the ways I’d like to document is by the blog post 😉

Cheers !

About Atulmaharaj

Maintaining the blog for the past 6 years, I'm a Foodie, Techie, Cricket Enthu, Traveler, Blogger and a Cook ! You'll find posts within a wide range of topics from food to technology. Favorite Quote: "Traveling is like reading a book, one who hasn't traveled, hasn't turned a page.

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