Error: unexpected inconsistency; run fsck manually [duplicate]

Solution 1:

  1. At the command-line, enter: "fsck /dev/sda6"

  2. Enter y when prompted to perform fixes.

https://ubuntuforums.org/showthread.php?t=789454

Solution 2:

To avoid data loss due to disk failure, this command should be given from a live Ubuntu session. Follow these steps:

  • You should burn a live Ubuntu CD.
  • Insert the live CD and try Ubuntu without installing.
  • Open a terminal and type the following command:

    sudo fsck /dev/sda1  
    
  • When prompted, type y to fix the errors.

That should be all. Your system will boot normally once this fix has been applied.