Just a quick note for anyone wanting to update their HD install of BT2 final.
Connect to the internet as normal.
Open console and type cd /pentest/wireless
then simply type update-aircrack.sh

The script goes off downloads the latest beta from Aircrack-ng.
Clears the current version on the HD and installs the latest 1.0beta version.

30 seconds and your done.
Hope this helps, worked for me .

here is the script and what it does.

svn co http://trac.aircrack-ng.org/svn/trunk/ aircrack-ng
cd aircrack-ng
make clean
make install
chmod 755 airoscript/airoscript.sh
cp airoscript/airoscript.sh /usr/local/bin/airoscript.sh