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