SurferTim:
I think the R1 version will show up as /dev/ttyUSB0. The R3 and the Mega show as /dev/ttyACM0.
The R1 Uno shows up as /dev/ttyACMx .Its earlier boards (Duemilanove, early Mega etc) with the FTDI interface that show as /dev/ttyUSBx .
My R1 works fine on Ubuntu 10.04 .