You try to run TrueCrypt and it pops this error:
TrueCrypt is already running
This error is typically caused if you abruptly shutdown your Linux, without giving TrueCrypt the chance to close properly. This leaves behind a lock file named
joe is your username. Delete this file and you will be able to run TrueCrypt again.
Tried with: TrueCrypt 7.1a and Ubuntu 12.04 LTS