Dun with network manager has now been broken for a few years.  We have
passed from hard kernel crashes on attempts to use it to the current
situation where the functionality is advertised and simply not working.

Now, I am on trusty and I do not know if my case is exactly the one
mentioned in this bug.

In my case, it is modemmanager to simply ignore the rfcomm0 device.

In fact, if I set up the device and then query modem manager with mmcli,
modemmanager says "no modem found". If I run modemmanager in debug mode,
it says that it cannot find the parent device of rfcomm0, so it skips
it.

Looks like a kernel bug.   On LKML there are posts about the kernel
failing to parent the rfcomm devices, causing regressions in
modemmanager.  Maybe the ubuntu kernel maintainers could take a look
into it and backport relevant fixes to the ubuntu 3.14 kernel (if there
are any).

But, even better, I really think that bluetooth DUN should be disabled
altogether in networkmanager in ubuntu, until the kernel, modemmanager
and networkmanager can support it properly.  It has now been in a broken
state for at least 3 (if not 4) ubuntu releases.  If it is not working,
at least do not tempt users to try it.

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https://bugs.launchpad.net/bugs/583728

Title:
  NetworkManager ignores the rfcomm port when it gets registered in
  blueman

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