[ubuntu_studio] Problems with jackd???

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http://ubuntuforums.org – Hi I am an reasonable experianced linux user. I usually manage to google most of my problems but this one has drawn a blank. I am trying to set up a little music recording thing to practise my guitar and keyboard on and record it on the computer but it does not seem to want to play ball. rakarrack or rosegarden etc it say's jackd is not working. My keyboard is conected with a midi to usb cable and my electric guitar is connected with a guitar link usb interface. Both new. When I try to start jack control it displays this message p, li { white-space: pre-wrap; } "Could not connect to J (Hardware)