(I'm not using Ubuntu for my desktop but I'have had the same problem. I'm 
running Pulseaudio 13 built with enable_bluez5_native_headset and Bluez 5.54)
Solved it by adding headset=native forthe module module-bluetooth-discover in 
default.pa :
 load-module module-bluetooth-discover headset=native
in ~/.pulse/default.pa  (or /etc/pulse/default.pa)
then restarting pulseaudio with pulseaudio -k
Since Pulseaudio 11.0 has ofono support, "headset=auto" option enabled by 
default, 

pactl list shows that both profiles with available: yes

Generally when using VoIP application automatically switch bluetooth
profile to HSP works , but when not or when switch back to A2DP need to
be done annually (for me, Blueman does the job with a few clicks).

Sound with HSP profile isn't very good and HFP doesn't seems to work as
I haven't setup phonesimp (ref
https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Bluetooth/
)

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https://bugs.launchpad.net/bugs/1576559

Title:
  Refused to switch profile to headset_head_unit: Not connected

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