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I have a Samsung 860 EVO 500 GB SSD that is just running a single boot Ubuntu 20.04 LTS Desktop. First off I have tried Grub rescue - error: unknown filesystem and I can't get past the ls portion of the solution. Which was similar to How to fix "error: unknown filesystem. grub rescue, When I input the following:

set root=(hd0,msdos1)
set prefix=(hd0,msdos1)/boot/grub
insmod normal
normal

I am still unable to boot into Ubuntu. Also both of this issues have a dual boot (Ubuntu/Windows) mine is a single boot. All that to clarify this is not a duplicate question.

When booting I get the following error:

error: unknown filesystem.

I tried to find the filesystem with the following but did not find it.

ls filesystem is unknown

UPDATE 10/23/2022

Taking the advice from @carles-mateo I installed ubuntu on a separate hard drive. I connected the Samsung 860 EVO 500 GB SSD to the new system on bootup I get the following when the hard drive is connected:

enter image description here

The new system starts up and I can view the disk from the Disks app. Here are all the partitions:

First:

First

Second:

Second

Fifth:

Fifth

Free Space:

Free Space

It seems that the First partition can be mounted and opened:

mount 1

It take a moment to load but here is what I see:

mount 2

user908759
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  • Could you clarify a few things? (1) has the machine been running Ubuntu 20.04 successfully for a period of time before this error appeared? (2) have you grabbed an installation USB to boot into a Live Session to run some tests on the SSD to see if it's toast? – matigo Sep 28 '22 at 09:51
  • @matigo It has been running for a 2+ years now. I have tried to use the live boot to inspect the drive but couldn't find anything. Can you elaborate on which tests you are talking about? – user908759 Sep 29 '22 at 09:33

1 Answers1

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Long history short:

  • Grab a new drive
  • Install Ubuntu 20.04 LTS on it
  • Connect your old drive using an external case, connected by USB
  • Make a backup with dd from the drive connected to USB, to a file (so you can recover if something is destroyed)

My expectation is that, connected as USB using an external case, to a full Linux with all the drivers installed (msdos/windows), it will be able to recognize the drive.

Cheers

Carles Mateo
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