You can uninstall or removes an installed gnuhtml2latex package itself from Debian 7 (Wheezy) through the terminal,
$ sudo apt-get remove gnuhtml2latex
If you would like to remove gnuhtml2latex and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove gnuhtml2latex
If you use with purge options to gnuhtml2latex package all the configuration and dependent packages will be removed.
$ sudo apt-get purge gnuhtml2latex
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 gnuhtml2latex