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