You can use the apt-get command to install Tomcat on Ubuntu. Here are the steps:

1. Update the package list by running the following command: sudo apt-get update
2. Install the Tomcat package using the following command: sudo apt-get install tomcat9
3. Start the Tomcat service by running the following command: sudo systemctl start tomcat9
4. Enable the Tomcat service to start automatically at boot time by running the following command: sudo systemctl enable tomcat9
5. Test the installation by accessing the Tomcat welcome page in a web browser: http://localhost:8080
6. To stop tomcat service you can use the following command: sudo systemctl stop tomcat9
7. To check the status of tomcat service you can use the following command: sudo systemctl status tomcat9

Using the apt-get command to install Tomcat will automatically handle dependencies and configure the service to start automatically at boot time.

You can also check the logs in /var/log/tomcat9/catalina.out for any errors.