According to #81, it looks like you still use a hacked pulseaudio:

                a2dp_sink_sbc: High Fidelity Playback (A2DP Sink: SBC) 
(priority 40, available: unknown)
                a2dp_sink_aac: High Fidelity Playback (A2DP Sink: AAC) 
(priority 40, available: unknown)
                a2dp_sink_aptx: High Fidelity Playback (A2DP Sink: aptX) 
(priority 40, available: no)
                a2dp_sink_aptx_hd: High Fidelity Playback (A2DP Sink: aptX HD) 
(priority 40, available: no)
                a2dp_sink_ldac: High Fidelity Playback (A2DP Sink: LDAC) 
(priority 40, available: unknown)


I suggest you use the original pulesauido in the kbuntu, and use a different BT 
headphone and that new 0b05:17cb ASUSTek Computer, Inc. Broadcom BCM20702A0 
Bluetooth to do the test.

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https://bugs.launchpad.net/bugs/1891648

Title:
  [0cf3:e301 Qualcomm Atheros]Cannot switch to A2DP profile w/o
  restarting bluetooth.service [pulseaudio: Refused to switch profile to
  a2dp_sink: Not connected]

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