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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?

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:
sudo pactl unload-module module-bluetooth-discover
sudo pactl load-module module-bluez5-discover

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.

The solution which has worked for months, was to upgrade to a newer version of bluez, as described here: Bluetooth doesn't work after resuming from sleep, Ubuntu 18.04 LTS. But recently I experienced regression: I get the same behaviour as before. But in an attempt to solve it, I downgraded to an old version of bluez and later upgraded back to the same version that stopped working properly (5.50-0ubuntu0ppa1 in my case) which solved the problem for now. So reinstalling seems to fix or mitigate something. Seems likely this can happen again sometime in the future ...

I had the same issue as the OP (disconnect after connect), but mine was using a CSR Bluetooth 4.0 Dongle.

My system was loading the bluez5-discover module and the bluetooth-discover module for some reason.

Performing the test above resulted in me being able to pair my Bluedio t5 headset.

Editing the /etc/pulse/default.pa like above resulted in the correct operation of bluetooth on my system through reboots.

Thank you!