WHat version Ubuntu are you using. I had 14.04 and now run with 16.04. And I run Cura 15.04.6.
What version Ubuntu do you use? On 14.04 you have to patch the python part to allow the 250000 baudrate that the printer uses.
It could be that you have problems with permissions for the serial communication. You can check that by running cura as root. If it works running as root then it is the permissions of the usb configuration...
What printer are you trying to use, and what version(s) of Cura did you try?
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