The commands suggested above in post 31 are distinct so if you did not have a /dev/nvme0n1p2 or a mount point /mnt, you would have received an error. The commands need to be entered separately. Information you posted earlier shows the nvme drive has a small EFI partition and an ext4 filesystem on the second partition which uses the rest of the drive. If you run the mount command suggested, you should then be able to see the / of the entire filesystem using the ls /mnt command suggested. Running lsblk as suggested with the options suggested would probably help.

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The commands suggested above in post 31 are distinct so if you did not have a /dev/nvme0n1p2 or a mount point /mnt, you would have received an error. The commands need to be entered separately. Information you posted earlier shows the nvme drive has a small EFI partition and an ext4 filesystem on the second partition which uses the rest of the drive. That should be your Ubuntu install. If you run the mount command suggested, you should then be able to see the / of the entire filesystem using the ls /mnt command suggested. Running lsblk as suggested with the options suggested would probably help.

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I had a similar problem. solutions that brought results:
$ sudo apt install os-prober
$ sudo os-prober #will even search hidden partitions I'll show you what systems you have
$ sudo update-grub
$ sudo reboot -f
it worked when I somehow started the system, e.g. life cd
another way is to boot from a bootable USB disk: boot-repair-cd (automatically repairs boot sectors and updates grub)

If you haven't solved it yet, I hope this will help you.
if you run it, mark solved and close the post :-)

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Hey everyone!

I just wanted to say thanks to everyone who chimed in. I had a friend look at it and I guess somehow I actually deleted the fstab. So he recreated the fstab in the live usb boot. So now it's working. Neither he nor I know how I managed to do that, but here we are! Thanks again for all the help!!

Good reason to have a notebook and pen when doing things like this to keep notes of actions. Saving it a text file works but not if you can't boot the computer although you could again use a 'live' usb. Glad you got it working.

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