sudo apt-get install -y tomcat5.5 tomcat5.5-admin tomcat5.5-webapps
If you're copying configuration over from a previous Tomcat / Ubuntu installation, you need to make sure the permissions on all the files you copy are set correctly. In most cases, you'll have to run :
chown -R tomcat55:adm [file and folder list here]
If you're securing the applications with a certificate, try to make sure it's valid for your location and ensure that you've set it properly in your server.xml configuration file. If you want useful logging, you'll also have to place a log4j.properties file in
Hope this helps.