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To me it seems like you face a communication problem. Does

  ls -l /dev/ttyACM0

show the correct permissions for the device? You need to have read and write permissions. Is the laser connected properly? Maybe try a different USB cable or something. Which laser are you using? I don't know if Hokuyo maybe has different communication protocols for different lasers.

To me it seems like you face a are facing communication problem. problems. Does

  ls -l /dev/ttyACM0

show the correct permissions for the device? You need to have read and write permissions. Is the laser connected properly? Maybe try a different USB cable or something. Which laser are you using? I don't know if Hokuyo maybe has different communication protocols for different lasers.