I can confirm the behavior. At least its possible to deactivate 'discoverable' and 'discovery' on the command line:
sudo hiconfig hci0 noscan Interesting: This survives a reboot! Note: 'discoverable' and 'discovery' is switched-on again when selecting the Bluetooth settings. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1787867 Title: Ubuntu 18.04 LTS bluetooth left discoverable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/indicator-bluetooth/+bug/1787867/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
