forward three ports to the the internal IP address of the BigBlueButton server. These ports are 80 (HTTP), 9123 (Desktop Sharing), and 1935 (RTMP).

sudo bbb-conf --setip external.host.org

Internally, BigBlueButton must be able to call external.host.org to make API requests. In this example, if the internal BigBlueButton server is at 192.168.10.198, add the following line to /etc/hosts (you’ll need to edit this file as root user).

sudo vi /etc/hosts

insert line

192.168.10.198 external.host.org

…

Ref: http://code.google.com/p/bigbluebutton/wiki/FAQ

Before you install

Ubuntu 10.04 32-bit or 64-bit server (or desktop)

• 2 GB of memory (4 GB is better)
• Dual-core 2.6 GHZ CPU (quad core is better)
• Ports 80, 1935, 9123 accessible
• Port 80 is available and not used by another application
• 400G of free disk space (or more) for recordings

Installation of BigBlueButton 0.8-beta-3

1. Update your server

# Add the BigBlueButton key
wget http://ubuntu.bigbluebutton.org/bigbluebutton.asc -O- | sudo apt-key add -

# Add the BigBlueButton repository URL and ensure the multiverse is enabled
echo "deb http://ubuntu.bigbluebutton.org/lucid_dev_08/ bigbluebutton-lucid main" | sudo tee  etc/apt/sources.list.d/bigbluebutton.list
echo "deb http://us.archive.ubuntu.com/ubuntu/ lucid multiverse" | sudo tee -a /etc/apt/sources.list

..

sudo apt-get update
sudo apt-get dist-upgrade