Bad super block

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  1. Reset language to default temporary:
export LANG=C
  1. Check which device it is:
lsblk --fs
  1. Get superblocks:
sudo dumpe2fs /dev/sdXY | grep -i superblock

Replace sdXY with your device.

  1. Check device with the superblock:
sudo fsck -b <superblock> /dev/sdXY
  1. If successful, then also check for badblocks:
sudo fsck -vcck /dev/sdXY