You can uninstall or removes an installed coinor-libcoinutils3 package itself from Ubuntu 14.04 LTS (Trusty Tahr) through the terminal,
$ sudo apt-get remove coinor-libcoinutils3
If you would like to remove coinor-libcoinutils3 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove coinor-libcoinutils3
If you use with purge options to coinor-libcoinutils3 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge coinor-libcoinutils3
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 coinor-libcoinutils3