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Hi Maite,
  I just set my Ubuntu system up last night.  The solution for me was to start XLaunch and on the 3 step (Specify parameter settings), check the "No Access Control", then save the configuration file.  You will get a warning about using the '-ac' flag, but it was the only way I could get Xming to work properly.

  Then in my .bashrc file, I added the following lines to automatically load the display IP address:

export DISPLAY=$(cat /etc/resolv.conf | grep nameserver | awk '{print $2; exit;}'):0.0


  Remember, when you modify the Xming configuration file through XLaunch, make sure that Xming is not running or the updated config file will not be saved.

Hope this helps.

Andrew
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Andrew Beaudin, PhD | Postdoctoral Scholar
University of Calgary | Cumming School of Medicine
Department of Clinical Neurosciences
HSC Rm 2935J, 3330 Hospital Drive N.W. | Calgary, AB | T2N 4N1
Phone: (403) 210-6273