@tajmasindi

The easiest method would be to use apt, by running:

sudo apt-get remove glassfish-* \
&& sudo apt-get purge glassfish-*

It’ll ask you to confirm the removal each time. You can also auto-answer yes by running:

sudo apt-get -y remove glassfish-* \
&& sudo apt-get -y purge glassfish-*

What the above commands do is:

1). Removes the installation
2). Removes the configuration left behind.