Error: "Cannot upgrade Citrix StoreFront with Receiver for HTML5" when upgrading to StoreFront 2.x

The following error is generated whenupgrading to StoreFront 2.x: "Error Cannot upgrade Storefront for Receiver for HTML5 Use the Citrix HTML5 HDX Engine Configuration tool to remove Receiver from HTML5 from all currently configured Receiver for Web sites. Then, uninstall Receiver for HTML5 and t...