You can uninstall or removes an installed comixcursors-lefthanded package itself from Ubuntu 16.10 (Yakkety Yak) through the terminal,
$ sudo apt-get remove comixcursors-lefthanded
If you would like to remove comixcursors-lefthanded and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove comixcursors-lefthanded
If you use with purge options to comixcursors-lefthanded package all the configuration and dependent packages will be removed.
$ sudo apt-get purge comixcursors-lefthanded
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 comixcursors-lefthanded