This may not be a bug. Even I faced this error which seems to be related to another error, blueman.bluez.errors.DBusFailedError for which I found the solution here: https://askubuntu.com/questions/801404/bluetooth-connection-failed-blueman-bluez-errors-dbusfailederror-protocol-no.
Hope this may help someone.
This may not be a bug. Even I faced this error which seems to be related to another error, blueman. bluez.errors. DBusFailedError for which I found the solution here: https:/ /askubuntu. com/questions/ 801404/ bluetooth- connection- failed- blueman- bluez-errors- dbusfailederror -protocol- no.
Hope this may help someone.