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      Mounting errors

      When a Ext4 filesystem stopped to mount properly enter in a terminal:

      dmesg | tail

      If the result is: "EXT4-fs (sda1): group descriptors corrupted!"

      Check for backup superblocks, replace the x’s with your partition name

      sudo mke2fs -n /dev/sda1

      "Superblock backups stored on blocks:

      32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208"

      Restore the superblock from the backup, again replacing the x’s with your partition name, and block_number with the first backup superblock

      sudo e2fsck -b block_number /dev/sda1 

      replace sda1 with the drive it is concerning.

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