Tomcat 7 Manager Quick Start on Ubuntu Linux
The Tomcat 7 Ubuntu Packaged Version is a Fragmentation of the Official Tomcat Distro.
So to Make your Way Easier on Tomcat 7 is Best to Avoid the apt-get Tomcat 7 Packages and Provide Directly to Download and Install the Official Tomcat 7 Distribution.
The Contents and Details are Expressly Essentials to Give Focus Only to the Essentials Instructions and Commands and Make the Tut Easier to Read & Understand ;)

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Install Apache Tomcat 7 Official Distro.
Tomcat 7 On Ubuntu Linux 12 -
Open a Terminal Window
(Press “Enter” to Execute Commands) -
Edit the tomcat-users.xml File
sudo nano $CATALINA_HOME/conf/tomcat-users.xml
Insert:
<role rolename=”manager-gui” />
<user username=”admin” password=”admin” roles=”manager-gui”/>.
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Restart Tomcat
sudo $CATALINA_HOME/bin/shutdown.sh
sudo $CATALINA_HOME/bin/startup.sh
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Access the Tomcat 7 Applications Manager on:
http://localhost:8080/manager
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Tomcat 7 Deployment Quick Start Guide