Serial can't find my devices

[b135802]

Ops, we forgot the basic rule, "when everything fails check the permissions"

Probably the sudo command will make the difference. Try with "sudo lsusb".

  Sorry, I should have thought about that myself.

Code:

pi@openplotter:~ $ sudo lsusb
Bus 002 Device 002: ID 0781:5583 SanDisk Corp. Ultra Fit
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 013: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port / Mobile Action MA-8910P
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

There is the Usb-gps - device 013. Is that the problem - Serial doesn't have the right permissions? Why not, and how do one correct it?