$ sudo apt-get remove isns-client 

Uninstall isns-client including dependent package

If you would like to remove isns-client and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove isns-client 

Use Purging isns-client

If you use with purge options to isns-client package all the configuration and dependent packages will be removed.

$ sudo apt-get purge isns-client 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove isns-client 

See Also,