Download:

http://code.google.com/p/bigbluebutton/wiki/BigBlueButtonVM

To install BBB manually:

sudo apt-get update
sudo apt-get install bigbluebutton 
sudo bbb-conf --clean
sudo bbb-conf --check

Check:

dpkg -l | grep bbb

Upgrade:

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

Set Static IP:

sudo vi /etc/network/interfaces

# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.3.90
gateway 192.168.3.1
netmask 255.255.255.0
network 192.168.3.0
broadcast 192.168.3.255

sudo /etc/init.d/networking restart

Ports:

BigBlueButton uses 3 TCP ports:

port 80 for the obvious web interface
port 9123 for desktop sharing
port 1935 for Adobe Flash Media Server (RTMP?) 

If the ports above are opened/ forwarded (firewall/ router) you have to execute the following command (on bbb) to make it reachable from external:

sudo bbb-conf --setip your.domainname.com

The BigBlueButton packages let you switch back and forth between using Asterisk and FreeSWITCH.

To switch from Asterisk to FreeSWTICH, do

sudo apt-get purge bbb-voice-conference 
sudo apt-get purge asterisk 
sudo apt-get install bbb-freeswitch-config 
sudo bbb-conf --clean 

To switch from FreeSWITCH to asterisk, do

 sudo apt-get purge bbb-freeswitch-config 
 sudo apt-get purge freeswitch 
 sudo apt-get install bbb-voice-conference 
 sudo bbb-conf --clean 

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

root@ubuntu:~#    sudo bbb-conf --check

BigBlueButton Server 0.71
                    Kernel version: 2.6.32-24-generic-pae
                      Distribution: Ubuntu 10.04.1 LTS (32-bit)
                            Memory: 2012 MB

/var/www/bigbluebutton/client/conf/config.xml
                Port test (tunnel): 192.168.1.20
                              Red5: 192.168.1.20

/etc/nginx/sites-available/bigbluebutton
                       server name: 192.168.1.20
                              port: 80
                    bbb-client dir: /var/www/bigbluebutton

/var/lib/tomcat6/webapps/bigbluebutton/WEB-INF/classes/bigbluebutton.properties (bbb-web)
                      bbb-web host: 192.168.1.20

/var/lib/tomcat6/webapps/bigbluebutton/demo/bbb_api_conf.jsp (API demos)
                  bbb-web-api host: 192.168.1.20

/usr/share/red5/webapps/bigbluebutton/WEB-INF/red5-web.xml
                  voice conference: FreeSWITCH

root@ubuntu:~# sudo bbb-conf --setip tmade.gotdns.com
Assigning tmade.gotdns.com for testing for firewall in /var/www/bigbluebutton/client/conf/config.xml
Assigning tmade.gotdns.com for rtmp:// in /var/www/bigbluebutton/client/conf/config.xml
Assigning tmade.gotdns.com for servername in /etc/nginx/sites-available/bigbluebutton
Assigning tmade.gotdns.com for http:// in /var/www/bigbluebutton/client/conf/config.xml
Assigning tmade.gotdns.com for web application URL in /var/lib/tomcat6/webapps/bigbluebutton/WEB-INF/classes/bigbluebutton.properties
Assigning tmade.gotdns.com for api demos in /var/lib/tomcat6/webapps/bigbluebutton/demo/bbb_api_conf.jsp