Веб-службы Amazon и экземпляр ubuntu 10.04 ec2

Я создал ubuntu 10.04 ec2, и теперь мне нужно установить tomcat apache и jdk6 на моем экземпляре, но всякий раз, когда я использую команду sudo apt-get install sun-java6-jdk или sudo apt-get install tomcat6 admin или sudo apt-get install ec2-api-tools

Package ec2-api-tools is not available, but is referred to by another package.
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package ec2-api-tools is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or is only available from another source
E: Package ec2-api-tools has no installation candidate