I'm not familiar with that distro but it may be a permissions problem. You may want to see where your distro puts the lock file and see if the permissions are correct. I ran into that once but I can't find the lock file anymore. It used to be in /var/lock but it is not there anymore. I upgraded KDE a week or so ago so they may have moved it. Sounds like Wal-Mart huh??
You may want to google for that error message. If you put it in quotes, you will get good matches and may run up on a fix too.
www.google.com/linux is a good start.
Sorry I can't be more help but this gives you a bump at least.
Later