I must confess I've never heard of Bastille Linux so I checked their home page
Marketing bullsh-t Windows style..... Could be very useful still
This seems to be something Bastille Linux wants to achieve...
I suppose you mean can't use sudo.log in to the terminal as root
Is Mint the only operating system in that computer?
If so and you have reinstalled completely we may have to use the heavy artillery. Describe your situation a bit better, including status of backups, we may have to wipe that disk clean.