Gfilui

After upgrade from 17.10 to 18.04, any device I connect to only stays connected for a couple of seconds. My laptop is a Lenovo P50 (20ENCTO1WW)

/var/log/syslog reports:

pulseaudio[????]: [pulseaudio] bluez5-util.c: Information about device /org/bluez/hci0/dev_???????? invalid
bluetoothd[????]: Endpoint replied with an error: org.bluez.Error.InvalidArguments

Obviously the question marks represent some id's (pid's and bluetooth id in this case)

Any clue on fix or workaround?

The solution was to upgrade to a newer version of bluez, as described here: Bluetooth doesn't work after resuming from sleep, Ubuntu 18.04 LTS

I ran into this issue on my Lenovo P51 running Ubuntu 18.04, and I discovered that the pactl module "module-bluetooth-discover" was not loading properly at boot time. I fixed the issue by replacing it with "module-bluez5-discover" in my pulse configuration.

You can test this by running:
pactl unload-module module-bluetooth-discovery
pactl load-module module-bluez5-discovery

And try to repair/reconnect your devices. If it works, replicate the following configuration in your /etc/pulse/default.pa config.

# Modify: /etc/pulse/default.pa
# Comment out the following line

.ifexists module-bluetooth-discover.so
load-module module-bluetooth-discover
.endif

# Replace it with ...

.ifexists module-bluez5-discover.so
load-module module-bluez5-discover
.endif

My suspicion is that this is a change that was made during the switch from Unity to Gnome and the leftover configurations remained, leaving the standard Bluetooth modules behind which don't load correctly.

After switching to bluez5, I have since had no issues, and Bluetooth connects without complaint on my mobile phone, mouse, and headset. :)

EDIT: I also followed several steps mentioned here: Bluetooth doesn't work after resuming from sleep, Ubuntu 18.04 LTS

To exactly replicate my configuration, make sure you apt-get install bluez blueman pulseaudio to have all the same packages. As was suggested in the referenced problem, I believe this was caused by upgrading to 18.04 from 17.04.