Keep in mind, iOS apps send your devices' serial number & MAC address via a simple API command, and this can all be done without asking for permission. If you b

Keep in mind, iOS apps send your devices' serial number & MAC address via a simple API command, and this can all be done without asking for permission. If you bought an iDevice in a store, you're also on CCTV buying that device and it can absolutely be traced to your canonical name. The idea behind Ubuntu tablets is that it imports the security model of the Debian Linux trust chain to the user, and so worries of serial numbers and the typical 'link-ability' one finds in proprietary iOS devices are vanished.