Ok, I should have a solution for you:
Run sudo gedit /etc/udev/rules.d/usb.rules
(you can also use nano, vi, whatever)
Enter the following contents
SUBSYSTEM=="usb", MODE="0666"
Save the file and close.
Then run:
udevadm control --reload-rules
Now plug your galvo USB connection back into the machine.
Run LightBurn without sudo and you should be able to automatically find and connect to the device.