Just a bit of an FYI. You can scan a document over wifi by opening your Chromium browser. You need the HP 6960's IP address (which can be found by touching the printers wifi symbol on the touchscreen) Enter this number into the browser's address bar and hit enter you will then be taken to a web page that allows you to scan and print from chromium, so if you import your documents to google docs you can print also. This was one of the methods I used when printing from the a chromebook, but seems equally useful with the Pi. If you have a different model of printer that prints and scans over wifi this method may be worth a try.