You can uninstall or removes an installed calligraauthor package itself from Ubuntu 16.04 LTS (Xenial Xerus) through the terminal,
$ sudo apt-get remove calligraauthor
If you would like to remove calligraauthor and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove calligraauthor
If you use with purge options to calligraauthor package all the configuration and dependent packages will be removed.
$ sudo apt-get purge calligraauthor
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 calligraauthor