Arduino Mega 2560 Not Recognized

Hello!
I have Ubuntu 12.04 (64 bit) and cant get the Arduino 1.0.5 IDE to work. I have downloaded all the required libraries and have attempted multiple times. What I see as the issue is the IDE is trying to connect on a windows COM port and not a ttyACMO port. Also when I go into the tools menu, serial port is blocked out and I cant select it. Any ideas? Thanks.

Update: Micro wont work either.