How to fix "error: unknown filesystem. grub rescue> [duplicate]

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Want to know how to fix grub rescue error with the help of single command? All you need is Windows installation or recovery disk. If you haven’t made it, you can use Hiren’s boot CD. (download link)

Error Shown

Unknown Filesystem

Grub Rescue

How It May Happen

There are many reasons, but most commons one is- If you have install Ubuntu along with windows, and you mess up with the partition or uninstall Ubuntu. In that case, the Grub is also uninstalled and since windows can’t find it, we can’t log in.

For Any system to boot into main memory, It requires MBR (master boot record). When MBR is damaged the system is damage the system is no longer able to load in the operating system. And error of grub rescue is shown

Follow the steps

1. Insert Windows 7 Installation or DVD win recovery disk, if you don’t have them, you can use Hiren’s boot cd.

2. Boot in cd/DVD drive. Usually, this is done by press combination of F8...

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The reason why this problem occurs because users are generally carried out under the window partition operations (many users will choose to install window and ubuntu dual system), such as disk partitioning and merging, etc., affect the original partition information.

Solution as follows

Step 1

First use the ls command shows the ubuntu partition installation information:

grub rescue>ls

Usually list all disk partition information, such as (hd0, gpt1) (hd0, gpt2) (hd0, gpt3) etc.

Step 2

Execute the following command:

grub rescue>set

Grub will list the current settings, such as prefix=(hd0,gpt1)/boot/grub,root=hd0,gpt1 or prefix=(hd0,gpt1)/grub,root=hd0,gpt1, precisely because these settings wrong , which leads to grub can not find the Ubuntu partition, followed by re-setting grub.

Step 3

If you know what ubuntu is installed on a partition, such as (hd0, gpt1), respectively, execute the following command

grub rescue>...
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Moderator

: split from another topic...

Hello everyone.
I have a specific issue and I tried researching this here on the forum however I cannot seem to find the exact post or problem that matche3s mine so apologies in advance if this has been solved already.

I recently updated Windows 10 on my UEFI hard drive last weekend. The original Windows 8.1 installation came with my Dell Inspiron i3531.
Stupidly I let Windows upgrade about a month ago from 8.1 to 10 and still everything was ok as I typically boot to my Linux Mint 17.3 partition for day-to-day use, but use Windows occasionally for work.

After this latest Windows 10 update, it seems to have altered the grub2 partition because after the update and restart I got this:
"Error: unknown filesystem. grub rescue"
I run ls
and I get all of my partitions listed so it looks fine from here (the Dell factory put a crap load of partitions for its own rescue images).
I looked up the error...

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Grub Issue

GRUB is GRand Unified Bootloader, the default bootloader for Linux kernel based Operating Systems. If you have a dual boot system, like Windows and Linux, then you may have some issues with GRUB. If you install Windows after Linux installation, then Windows puts its own bootloader on the MBR. So GRUB is no longer visible. GRUB needs to be reinstalled in this case. This article provides some scenarios that leave the GRUB unbootable and how GRUB can be reinstalled in order to fix the problem.

GRUB Rescue

When GRUB is unable to boot your system, or is unable to find the second stage, it drops the user to the GRUB prompt that looks like:

error: unknown filesystem
grub rescue >

Reinstall GRUB

First of all, you need to boot your system. At the GRUB prompt, you can run the following commands to boot your system up.

root (hd0,0)
kernel /vmlinuz-2.6.18-238.el5 ro root=/dev/sda1
initrd /initrd-2.6.18-238.el5.img
...

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Please Help,

I have a Windows 7 and Fedora 20 dual boot pc .

Today i deleted the fedora partition from windows disk management and then restarted my pc.
Now i am stuck in the 'grub rescue > ' screen ...... It is showing 'no such partition ' , after searching through the internet i tried these commands......

grub rescue > set boot=(hd0,msdos6)

grub rescue> set prefix=(hd0,msdos6)/ boot/grub

grub rescue> insmod normal (after this line ,i am getting the error , grub rescue > unknown filesystem)

grub rescue> normal

Don't know what to do ,but i want to get back to the windows os first ,also i don't have the windows or fedora live cd . My Windows recovery is stored in my pc hard drive....... plzz help so that i can resolve this...

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Yoloassswag

hi there i restarted my pc i was in windows 8 about to try and install windows xp on top along with zorin but when i turned my pc back on it came up with
error: unknown filesystem.
entering rescue mode...
grub rescue>
so then i went online on youtube and found how to fix it but it diden't work i put in ls the the partitions came up then i tryed one of them by typing ls (hd0,msdos4) then enter it said (hd0,msdos4): filesystem is ext2. then i put
set boot=(hd0,msdos4) then i hit enter then i put
set prefix=(hd0,msdos4)/boot/grub then i hit enter then i put
insmod normal and i hit enter and it came up with
error file `/boot/grub/i386-pc/normal. mod' not found
what can i do to fix it...

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You need to be clear about what version of grub you're using (or want).

Grub "legacy" is the traditional one, very stable, used in most distros, especially the ones focused on stability. It hasn't been developed much at all for a long time.

Grub 2 is the new one, actually currently at 1.98 - technically still a beta I believe, but even legacy never got past .99 or so. A lot has changed from legacy, and it's under very active development - many people don't think it's good enough for production yet, but IMO it's because they're not used to its new ways yet.

Several cutting-edge distros are now shipping with Grub 2, most notably Ubuntu since a few versions ago now, so that's an indication that it is production ready.

So to answer your question - Grub legacy is most easily re-installed from "Super Grub Disc".

For Grub 2, boot from the LiveCD (regular desktop installation CD) for the most recent Ubuntu. The Super Grub2 Disc is a great tool and...

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FIx error unknown filesystem Grub rescue mode
unknown filesystem grub rescue mode in linux or ububntu or windows
Sometime when you start your system (with dual boots) an unknown file system error is displayed and your system is in rescue mode.so you can solve this by follow the commands as shown in the video.

use this:
1. grub rescue/ set boot=(hd0,msdos5)

2. grub rescue/ set prefix=(hd0,msdos5)/boot/grub

3. grub rescue/ insmod normal

4. grub rescue/ normal

Error: unknown filesystem
Entering rescue mode…
grub rescue mode
FIX GRUB RESCUE UNKNOWN FILE SYSTEM ERROR
you can find this kind of problem when you are using duel boot operating system like
linux and windows
ubuntu and windows

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