Received this bug today in Ubuntu 13.04 after login without interaction. As far as I remember I received this bug sometimes in Ubuntu 12.10 too. I have a Lenovo T500 with F3507g WWAN-Module which stays always disabled in network manager because i don't need it. I guess that it appeared after enabling that hw module in bios for potential use.
Received this bug today in Ubuntu 13.04 after login without interaction. As far as I remember I received this bug sometimes in Ubuntu 12.10 too. I have a Lenovo T500 with F3507g WWAN-Module which stays always disabled in network manager because i don't need it. I guess that it appeared after enabling that hw module in bios for potential use.