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Solution (for ROS groovy and Ubuntu 12.04LTS 64bit):
You need to edit your bashrc file by doing the next in terminal: $gedit ~/.bashrc
After that you need to specify the path like this (just copy and paste somewhere inside):
export ROS_PACKAGE_PATH=/home/YOURNAME_PROBABLY/catkin_ws/install/share:/home/YOURNAME_PROBABLY/catkin_ws/install/stacks:/home/YOURNAME_PROBABLY/catkin_ws:$ROS_PACKAGE_PATH
Info: catkin_ws is the catkin workspace that you should have settled up during ROS installation
After that I had also the problem while running: rosrun rosserial_python serial_node.py /dev/ttyUSB0
That USB0 should be ACM0 (for arduino)
That was it in short!