<pre>$ sudo udevadm control --reload-rules</pre>
Finally log out & in again for the group change to take effect.
== Getting the AVR Toolchain ==
Many of the tutorials use the AVR XMEGA microcontrollers as a target. In order to compile code for these targets, you'll need the AVR toolchain. This is easy to set up:
<pre>
sudo apt-get install avr-libc gcc-avr
</pre>
= MAC OS X =