Hi, I have an issue with modemmanager version 1.4.12 in ubuntu 16.04. It doesnt start by itself and when I try to start it trough shell I get the following error: 
ModemManager[11742]: <info>  ModemManager (version 1.4.12) starting in system bus...
ModemManager[11742]: <warn>  Could not acquire the 'org.freedesktop.ModemManager1' service name
ModemManager[11742]: <info>  ModemManager is shut down 
 in debug mode i get:
ModemManager[12020]: <debug> [1468430437.178631] [mm-plugin-manager.c:877] load_plugins(): Loaded plugin 'Cinterion'
ModemManager[12020]: <debug> [1468430437.178641] [mm-plugin-manager.c:902] load_plugins(): Successfully loaded 29 plugins
ModemManager[12020]: <warn>  [1468430437.178916] [main.c:101] name_lost_cb(): Could not acquire the 'org.freedesktop.ModemManager1' service name
ModemManager[12020]: <debug> [1468430437.178935] [mm-base-manager.c:814] set_property(): Stopping connection in object manager server
ModemManager[12020]: <info>  [1468430437.179232] [main.c:187] main(): ModemManager is shut down