Meanwhile, on Ubuntu 16.04 and with network-manager
1.2.2-0ubuntu0.16.04.3, from my side I have no longer the described
issues. Both ModemManager, NetworkManager and nm-applet are working

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  nm-applet regularly crashes at logon, in combination with failing 3G

Status in network-manager-applet package in Ubuntu:

Bug description:
  I'm running Ubuntu 15.10 with network-manager 1.0.4-0ubuntu5.2.

  Regularly (if not always) the nm-applet icon is not showing in the
  Unity panel after logon.  Syslog shows these error messages:

  Jan 23 21:07:21 desk1 gnome-session[3904]: (nm-applet:4812): 
nm-applet-WARNING **: Could not find ShellVersion property on org.gnome.Shell 
after 5 tries
  Jan 24 09:42:37 desk1 gnome-session[19922]: (nm-applet:20700): 
libnm-glib-WARNING **: Error in get_property: Method "Get" with signature "ss" 
on interface "org.freedesktop.DBus.Properties" doesn't exist
  Jan 24 09:42:38 desk1 gnome-session[19922]: (nm-applet:20700): 
nm-applet-WARNING **: Cannot grab information for modem at 
/org/freedesktop/ModemManager1/Modem/0: No ModemManager support
  Jan 24 09:42:38 desk1 gnome-session[19922]: (nm-applet:20700): 
nm-applet-WARNING **: ModemManager is not available for modem at 
  Jan 24 09:42:38 desk1 gnome-session[19922]: message repeated 3 times: [ 
(nm-applet:20700): nm-applet-WARNING **: ModemManager is not available for 
modem at /org/freedesktop/ModemManager1/Modem/0]
  Jan 24 09:42:38 desk1 gnome-session[19922]: 
nm-applet:ERROR:applet-device-broadband.c:644:get_icon: assertion failed: (info)

  Manually starting nm-applet from a Terminal works, sometimes however
  only after some attempts where error messages similar to the ones
  above are shown (btw, even when succeeding, the first 2 warning/error
  messages on the ss signature and the ShellVersion show up). Once nm-
  applet is started, the 3G modem connection signal bars are shown and
  sometimes indeed a network connection (through 3G modem) is available.
  Often however, several manual disconnect and subsequent connect
  operations are needed before having the  network connection really up
  and running.

  I suspect hence that there is an issue with my ModemManager and/or
  NetworkManager configuration or implementation, and that nm-applet is
  not robust enough to properly deal with these connection failures.

  I have no issues on another Ubuntu 15.10 system with the same version
  of network-manager installed.

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