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