You can uninstall or removes an installed giella-sme package itself from Ubuntu 17.04 (Zesty Zapus) through the terminal,
$ sudo apt-get remove giella-sme
If you would like to remove giella-sme and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove giella-sme
If you use with purge options to giella-sme package all the configuration and dependent packages will be removed.
$ sudo apt-get purge giella-sme
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 giella-sme
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