install red5 in the ubuntu:
install sun-java5-bin by apt-get
$sudo apt-get install sun-java5-bin
then download deb package in the red5 website. I used version 0.7.0(final). Try command:
$sudo dkpg -i red5_0.7.0_all.deb
$/etc/init.d/red5 start
finially: open your web browser, access web address http://localhost:5080
for configuration red5 server. you can find the conf file in the /usr/lib/red5/conf. and the service apps is in the /usr/lib/red5/webapps