in my case I have to do rmmod btusb; modprobe btusb

<rant>
it looks to me like every new release of Ubuntu manages to break Bluetooth 
audio in some way that is new and creative and ever-increasingly difficult to 
automate away: 
 * 14.10 and before - volume wouldn't be restored, sink wouldn't switch; solved 
by having a script listen to dbus for a headphone connection event and tell 
pulseaudio to set the default sink and restore volume
 * 15.04 - no sound unless I disconnected and reconnected again; put that in a 
script
 * 15.10 - needed to connect manually, but at least the rest worked; solved by 
having a script look if the phones are connected, do a l2ping to see if they 
are available and connect; occasionally I'd have to rmmod btusb; modprobe btusb
 * 16.04 - this issue; I only managed to upgrade yesterday, I still haven't 
found a pattern to this madness
</rant>

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https://bugs.launchpad.net/bugs/1577197

Title:
  Pulseaudio bluez5-util.c: TryAcquire() failed  - Operation Not
  Authorized

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