I seem to be having some issues, firstly not being able to access the ntfs partition because I no longer have the right privileges.

How this happen..

From my login name 'K', I went into the Administration menu selecting User and Groups, from this panel I added 3 new users.


Thinking all was fine I closed the window, and had to reboot after an update.

The sudo command will no longer work apart from being in root, and nor can I in User and Groups click on unlock?,


I get the 'Could not authenticate' an unexpected error has occurred, error message.

how can I fix this?


If I log off this session and log back in, Why will it not let me log in as root, if I could, all this could be fixed..


Is there a way to fix the user group using the shell?