TrueCrypt is already running error

Problem

You try to run TrueCrypt and it pops this error:

<code>TrueCrypt is already running
</code>

Solution

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 ~/.TrueCrypt-lock-joe, where 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