Hi Piero, a little bit more information would be helpful. On Wed, Apr 21, 2010 at 10:49 AM, Piero Cosi wrote: > SECOND question > I tried also to install everything with your preferred method > sudo apt-get.....but I got ERRORS > > ros-boxturtle-base > Depends: ros-boxturtle-image-pipeline (= 1.0.0-9-jaunty) but it is not going > to be installed > Depends: ros-boxturtle-vision-opencv (= 1.0.2.9-jaunty) but it is not going > to be installed What package are you trying to install? How did you format the apt-get install line? Have you ever installed ros via the apt repositories before, or is this the first time? My best guess is that there is a dependency conflict. Could you send me the full text from the invocation of the command all the way through the end of the error messages. There might be some more relevant information in there. Alternatively, what happens if you just try to install the opencv package: > sudo apt-get install ros-boxturtle-vision-opencv