Even after a few apt dist-upgrades over time, no change. 
dmesg has as last two lines 

[ 3427.065250] cdc_ncm 1-9:2.0 wwp0s20f0u9c2: 5 mbit/s downlink 43 mbit/s uplink
[ 3443.039348] cdc_ncm 1-9:2.0 wwp0s20f0u9c2: network connection: disconnected

and journalctl has

Jan 17 07:12:03 msbi-corei NetworkManager[1294]: <info>  [1516169523.3293] 
(ttyUSB0): modem state changed, 'registered' --> 'connecting' (reason: 
user-requested)
Jan 17 07:12:03 msbi-corei NetworkManager[1294]: <info>  [1516169523.3306] 
(ttyUSB0): modem state changed, 'connecting' --> 'registered' (reason: 
user-requested)
Jan 17 07:12:03 msbi-corei NetworkManager[1294]: <warn>  [1516169523.3310] 
modem-broadband[ttyUSB0]: failed to connect modem: Only IPv4 is supported by 
this modem
Jan 17 07:12:03 msbi-corei NetworkManager[1294]: <info>  [1516169523.3310] 
device (ttyUSB0): state change: prepare -> failed (reason 'unknown', internal 
state 'mana
Jan 17 07:12:03 msbi-corei NetworkManager[1294]: <warn>  [1516169523.3318] 
device (ttyUSB0): Activation: failed for connection 'FONIC Default'

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https://bugs.launchpad.net/bugs/1735981

Title:
  Huawei ME936 mobile broadband can't connect

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