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The poblem you have is around rosversion. This should be the correct output:

$ rosversion roslaunch

rosversion is part of python-rospkg. So you can initially make sure that this is up to date, and no old easy_install version of rospkg luring in /usr/local/lib/python2.7/dist-packages

I'd guess an outdated version of rospkg is a likely culprit for your error