http://code.google.com/p/security-onion/issues/detail?id=80
http://code.google.com/p/security-onion/issues/detail?id=87
To download and run the upgrade script, open a terminal and execute the following:
wget http://downloads.sourceforge.net/project/security-onion/security-onion-upgrade.sh
sudo bash security-onion-upgrade.sh