Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: Invalid <param> tag: Cannot load command parameter [rosversion]: no such command [rosversion roslaunch].
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: Param xml is <param command="rosversion roslaunch" name="rosversion"/>
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: The traceback for the exception was written to the log file
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: ... logging to /var/lib/snaps/face-detector.sideload/IKNQVeagEYCc/ros/log/5cfbe708-bbbf-11e5-8517-0090f5ccd32c/roslaunch-localhost.localdomain-3898.log
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: Checking log directory for disk usage. This may take awhile.
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: Press Ctrl-C to interrupt
Jan 15 19:37:07 localhost.localdomain ubuntu-core-launcher[3898]: [103B blob data]
Jan 15 19:37:07 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Main process exited, code=exited, status=1/FAILURE
Jan 15 19:37:07 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Unit entered failed state.
Jan 15 19:37:07 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Failed with result 'exit-code'.
Jan 15 19:37:08 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Service hold-off time over, scheduling restart.
Jan 15 19:37:08 localhost.localdomain systemd[1]: Stopped service for face-detector.
Jan 15 19:37:08 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Start request repeated too quickly.
Jan 15 19:37:08 localhost.localdomain systemd[1]: Failed to start service for face-detector.
Jan 15 19:37:08 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Unit entered failed state.
Jan 15 19:37:08 localhost.localdomain systemd[1]: face-detector_face-detector_IKNQVeagEYCc.service: Failed with result 'start-limit'.