$ sudo apt-get remove ip2host 

Uninstall ip2host including dependent package

If you would like to remove ip2host and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove ip2host 

Use Purging ip2host

If you use with purge options to ip2host package all the configuration and dependent packages will be removed.

$ sudo apt-get purge ip2host 

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 ip2host 

See Also,