Tomcat7不会在ubuntu上启动(clean install)，权限被拒绝

I have a clean ubuntu installation (14) and try to run Tomcat7. I have installed it via terminal, run the "sudo service tomcat7 start" command which should start tomcat, but when I try to open: localhost:8080, the welcome index page is not loading and I get a 404 error (file not found). The 8080 port is not opened either, it seem like some kind of permission problem.I have a clean ubuntu installation (14) and try