My PC locked up with Audacity open. After restarting the PC several times, when I start Audacity, I get the following "The system has detected that another copy of Audacity is running." and won't start. I'm running Ubuntu 12.04 and Audacity 2.0.0. I've tried killall audacity, deleting the audacity data dir and reinstalling audacity. Please help. All my data was saved. I just need to use Audacity for my daughter's music. I've posted this on an Audacity forum with no response. I'm hoping someone here can help. Please.