When it tells you to run fsck, do it. You will be asked for a password.

See: https://help.ubuntu.com/community/SystemAdministration/Fsck

Note that you need to tell it what to check. It should look something like
fsck dev/sda1

I believe that you can also change fstab to change 01 and 11s at the end of
the line to 00, but have never tried this as fsck has always worked.

One final thought, don't shutdown that way!