I built an image with this kernel snap added to extra-snaps, and it seems to find it now:
ubuntu@localhost:~$ sudo bluetoothctl [NEW] Controller 00:00:00:00:5A:AD BlueZ 5.47 [default] Agent registered -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1810797 Title: bluetooth controller not detected with 4.15 kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1810797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs