Lubuntu 12.10 (?) dual boot with Win 7. Toshiba notebook sort of thing.

Since the upgrade to 12.10, can no longer log in, screen keeps coming back for username and login details repeatedly.

Booted into rescue mode, ran a few commands found by doing the usual Google searches, still not able to log in.

Confirmed user name and changed password as per these commands.

Now in rescue mode get error message "File system is NOT clean" (next line) File system seems mounted read-only".

Maybe this is the cause of my issues?

How do I make the file system "clean", and what else do I need to do?

As usual, thanks in advance!