There are various ways to view for open ports on your local Ubuntu/Linux machine. However, I particularly prefer two methods/command below, since it is simple, and without any third-party application.
Open your command prompt, and type:
netstat -an | grep "LISTEN "
Or, another method:
sudo netstat --tcp --udp --listening --program
It will list all ports that your machine are listening to. The latter method will even shows the program name associated to it.
Enjoy.
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