Unable to start Ubuntu 16.04 after installing tomcat

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Unable to start Ubuntu 16.04 after installing tomcat
I am using Ubuntu 16.04 version.
Yesterday I installed Tomcat and referred link https://devops.profitbricks.com/tutorials/how-to-install-and-configure-tomcat-8-on-ubuntu-1604/
After installation, the tomcat was running successfully - because I was able to browse tomcat home page in browser.
However when I restarted Ubuntu, it is unable to start...unable to move after entering login credential of Ubuntu...blank screen is shown.
Something like this?
– Jeroen Heier
Aug 12 at 6:00
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installed latest version of tomcat...9.X...Apache tomcat web site.
– AmolR
Aug 12 at 5:34