UMTS-Modem GOBI2000 not connecting in 17.04 and above

[Karl Stephan Stille]

After Upgrading from xenial to zesty and further on to artful UMTS connection through GOBI2000 modem stopped working.
It is an issue of modemmanager and network-manager.

First modemmanager now reports type as "gsm" and no more "wwan" so the filter in /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf should be updated to

unmanaged-devices=*,except:type:wifi,except:type:wwan,except:type:gsm

Second, the gobi plugin of modemmanager was removed in end of 2015. Versions below 1.6.12 do not work with GOBI2000 devices.

This bug has been filed here:
https://bugs.freedesktop.org/show_bug.cgi?id=104795

Tried the proposed solution to compile version 1.6.12 from source on artfuland it works.

Please update modemmanager to version 1.6.12 in Ubuntu.