You can uninstall or removes an installed libgail18 package itself from Ubuntu 17.04 (Zesty Zapus) through the terminal,
$ sudo apt-get remove libgail18
If you would like to remove libgail18 and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libgail18
If you use with purge options to libgail18 package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libgail18
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 libgail18
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