To uninstall xscreensaver-screensaver-dizzy just follow these instructions.
sudo apt-get remove xscreensaver-screensaver-dizzy
This will remove just the xscreensaver-screensaver-dizzy package itself.
sudo apt-get remove --auto-remove xscreensaver-screensaver-dizzy
This will remove the xscreensaver-screensaver-dizzy package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for xscreensaver-screensaver-dizzy then this will work.
sudo apt-get purge xscreensaver-screensaver-dizzy
Or similarly, like this xscreensaver-screensaver-dizzy
sudo apt-get purge --auto-remove xscreensaver-screensaver-dizzy
|Maintainer||Debian Perl Group <firstname.lastname@example.org>|
|Description||Graphics demo that makes you dizzy (XScreenSaver hack) background to make you dizzy. Textures can be cross-faded and there is a mode that automatically changes textures, allowing dizzy to be run as a screensaver.|