Similar happens in Linux Mint 19 system with no Bluetooth devices.
In Settings/Bluetooth, I have no Bluetooth devices and all settings are set to
"off".
In output of journalctl, I see this while booting:
pulseaudio[2770]: [pulseaudio] bluez5-util.c: GetManagedObjects() failed:
I see the messages (starting with "Could not find key with description")
on a fresh install of Linux Mint 19 Cinnamon.
Second line of kern.log says: "Linux version 4.15.0-36-generic
(buildd@lgw01-amd64-031) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3))
#39-Ubuntu SMP Mon Sep 24 16:19:09 UTC 2018
