Public bug reported:

Installed a 18.04 server image, and installed NetworkManager.

NetworkManager comes with a "/usr/lib/NetworkManager/conf.d/10-globally-
managed-devices.conf" file where it speciefies that all devices are by
default unmanaged except for types "wifi" and "wwan".

Now, the problem is that the filter should apply to "gsm" or "cdma"
types, not "wwan".

E.g.:
  [keyfile]
  unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma

Before the change:
$ nmcli d
DEVICE    TYPE      STATE      CONNECTION 
wlan0     wifi       connected  Bumbu
eth0      ethernet  unmanaged  --         
cdc-wdm0  gsm       unmanaged  --         
lo        loopback  unmanaged  -- 

After the change:
$ nmcli d
DEVICE    TYPE      STATE      CONNECTION 
wlan0     wifi       connected  Bumbu
cdc-wdm0  gsm       connected  cell       
eth0      ethernet  unmanaged  --         
lo        loopback  unmanaged  --

** Affects: network-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1780606

Title:
  NetworkManager not able to manage WWAN devices in 18.04 server

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