The bug is still there as of LibO 7.3.x. Up in comment 12
(https://bugs.documentfoundation.org/show_bug.cgi?id=120663#c12) there
is a nice analysis of the underlying problem why the remote cannot work.

Established that, I think that most users go used to the fact that the
remote functionality does not work in linux. Personally, I have
uninstalled the android app on the phone so I do not have an unfortunate
reminder about it. In fact, the real issue is probably the advertisement
of a functionality that is not there.

For the time being I suggest disabling the remote-via-bluetooth
functionality in linux and closing the bug by simply saying that the
remote via bluetooth cannot be supported on linux where there are
evidently issues that span other software pieces such as the bluetooth
stack and pulse audio. To the best of my understanding, these involve
the hijacking of the default rfcomm channel by pulse audio before it
even needs it and the lack of a standard approach to let other
applications find a free channel to use and advertise it to their
counterparts.

Alternatively (but I would not consider this a good solution), the
configuration options could be enhanced to add the possibility to choose
a bluetooth channel in libreoffice and in the mobile phone application,
so that the user can manually work around the fact that the predefined
channel is locked by some other application.

As a final point, note that even if the remote-via-wifi may seem a good
alternative, in fact in most cases it is practically useless.  In most
cases, presentations will not be given at a place where you control the
network, but at sites with site-provided wifi, such as universities,
schools, conference places, business sites, etc. All these locations
tend to have wifi deployments that block stuff on the ports used by
impress remote.

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https://bugs.launchpad.net/bugs/1798400

Title:
  [upstream] Regression: cannot use impress remote over bluetooth with
  ubuntu bionic

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