I am trying to use the ACI Tool to check if my UAV is propertly connected to my PC (Ubuntu), I am using the AscTec USB-adapter to connect the HL Serial 0 and my PC. When I run the ACI Tool I am asked to type the device number (/dev/ttyUSBX), so I type: 0 because after plugging it and typing "dmesg" in the termal, it says that the device is attached to ttyUSB0. Nevertheless, ACI tool says "Error: Cannot open device". I have tried it using many numbers (from 0 to 9 and even 000, 001, and so on), but none of them could be opened. On the other hand, I don't have such problem in Windows (in a different PC), but I need an apropiated connection using Linux in order to easily test the ACI Remote (I have already executed the tutorials 1 and 2, but nothing happened).