I have a Nexus 4 with Ubuntu 14.10 (r243) running on it. None of my installed apps can access GPS information. OSM Touch says "No GPS available", and Google Maps says "Your location could not be determined." I installed the SensorStatus app as well, but it fails to fill in any of the fields in the GPS screen, even though it says "Found supported backend" with a green check mark next to it.
I asked on #ubuntu-touch, and was told to "Go back to the original welcome screen and allow these apps to use GPS", but after a good deal of Googling, I was unable to figure out how to do that.
What can I do?