[PD] [comport] ** ERROR ** could not open device /dev/ttyACM0: failure(13): Permission denied

[Alexandros Drymonitis]

I have an Odroid which I use either with an SD card or an eMMC module, both
with the same OS (Debian Jessie for Odroid). In the SD card I've got
Pd-0.45-5 and in the eMMC module I've got Pd-0.46-0 installed.
With the SD card I can open the port /dev/ttyACM0 (I've got a Teensy 3.1
plugged in via USB) but with the eMMC module I get this error:
"[comport] ** ERROR ** could not open device /dev/ttyACM0:
 failure(13): Permission denied"

Any idea why is that? And how can it be solved?
I've checked the /dev/ directory and the port exists in both the SD and the
eMMC.
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