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  1. ubuntu@ubuntu:~$ sudo swapoff -a
  2. ubuntu@ubuntu:~$ sudo fsck /dev/sda
  3. fsck from util-linux 2.20.1
  4. e2fsck 1.42.9 (4-Feb-2014)
  5. ext2fs_open2: Bad magic number in super-block
  6. fsck.ext2: Superblock invalid, trying backup blocks...
  7. fsck.ext2: Bad magic number in super-block while trying to open /dev/sda
  8.  
  9. The superblock could not be read or does not describe a valid ext2/ext3/ext4
  10. filesystem. If the device is valid and it really contains an ext2/ext3/ext4
  11. filesystem (and not swap or ufs or something else), then the superblock
  12. is corrupt, and you might try running e2fsck with an alternate superblock:
  13. e2fsck -b 8193 <device>
  14. or
  15. e2fsck -b 32768 <device>
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