When connecting a device doesn't work this normally means that there is
no handler for the profiles bluez tries to connect with.  "Connecting
with a bluetooth device" means "Connecting with a profile". When you
enter "connect <mac addr>" in bluetoothctl bluez will go through all
profiles the remote devices provides, looking for an handler for this
profile (either in bluetoothd or in another service like pulseaudio for
A2DP/HFP) and if a handler is found it will be to connect with that
profile.

Can you do the following:

$ sudo systemctl stop bluetooth
$ sudo bluetoothd -n -d

in another terminal

$ bluetoothctl
# connect <dev addr>

and then attach the output of bluetoothd here?

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https://bugs.launchpad.net/bugs/1492441

Title:
  Cannot connect to 1byone bluetooth keyboard (after successfully
  pairing)

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