Comment 1 for bug 861464

Ubuntu 12.04 with updated kernel.
$ uname -a
Linux t420 3.4.4-030404-generic #201206221555 SMP Fri Jun 22 19:56:36 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Jul 19 19:19:23 t420 NetworkManager[2083]: <info> Activation (ttyACM1) starting connection '3g'
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> (ttyACM1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> Activation (ttyACM1) Stage 1 of 5 (Device Prepare) scheduled...
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> Activation (ttyACM1) Stage 1 of 5 (Device Prepare) started...
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> Activation (ttyACM1) Stage 1 of 5 (Device Prepare) complete.
Jul 19 19:19:23 t420 NetworkManager[2083]: <warn> GSM connection failed: (32) Operation not supported
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> (ttyACM1): device state change: prepare -> failed (reason 'unknown') [40 120 1]
Jul 19 19:19:23 t420 NetworkManager[2083]: <warn> Activation (ttyACM1) failed.
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> (ttyACM1): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jul 19 19:19:23 t420 NetworkManager[2083]: <info> (ttyACM1): deactivating device (reason 'none') [0]
Jul 19 19:19:23 t420 NetworkManager[2083]: nm_system_iface_flush_routes: assertion `ifindex > 0' failed
Jul 19 19:19:23 t420 NetworkManager[2083]: nm_system_iface_flush_addresses: assertion `ifindex > 0' failed