I have Ubuntu 10.04 (I tried higer, but unity is lagging; yes it's Ubuntu 10.04, it's only theme) and I can't start Rakarrak, Mixx, Internet DJ Console and other programs for mixing songs. It's showing me this (rakarrak):
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I tried to start JACK Control server, but it starts and the window goes black and I can't close it.
How can I fix this problem?