$ sudo apt-get remove nikto 

Uninstall nikto including dependent package

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

$ sudo apt-get remove --auto-remove nikto 

Use Purging nikto

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

$ sudo apt-get purge nikto 

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 nikto 

See Also,