[phone] [ubuntu touch] indicator-network-service fail to start

When I start my BQ Aquaris 4.5, I see a gear with "indicator-network" written with nothing in the panel instead of the real indicator menu.

The settings are also buggy :
Wifi : I see only saved networks
Phone network : I cannot enable data.

I do not know much about ubuntu touch, I tried the following command, and I get an error :

root@ubuntu-phablet:/# ./usr/lib/arm-linux-gnueabihf/indicator-network/indicator-network-service
Error getting the bus address: Cannot autolaunch D-Bus without X11 $DISPLAY
(process:8397): GLib-GIO-CRITICAL **: g_dbus_connection_get_unique_name: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
terminate called after throwing an instance of 'std::logic_error'
  what(): basic_string::_S_construct null not valid

Aborted (core dumped)

Before the bug, I activated simultaneously :
 - 3G
 - wifi
 - VPN

I turned wifi hotspot on, and a bit later the phone froze on a black screen. I turn it off with power button for 5 seconds.

On reboot, the indicator-network show a gear with empty menu.

3G + wifi hotspot + vpn worked many times before.

I run last update : OTA 13.