Same problem here.  I upgraded to xubuntu 18.04 and now have no
bluetooth adaptor.

Linux me 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux

 dmesg | grep Blue

[    9.349903] Bluetooth: Core ver 2.22
[    9.349994] Bluetooth: HCI device and connection manager initialized
[    9.356787] Bluetooth: HCI socket layer initialized
[    9.356798] Bluetooth: L2CAP socket layer initialized
[    9.356821] Bluetooth: SCO socket layer initialized
[    9.648950] Bluetooth: hci0: don't support firmware rome 0x31010000
[    9.799444] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    9.799449] Bluetooth: BNEP filters: protocol multicast
[    9.799459] Bluetooth: BNEP socket layer initialized

lsusb:

Bus 002 Device 003: ID 2232:1054 Silicon Motion 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 002: ID 0cf3:3004 Atheros Communications, Inc. AR3012 Bluetooth 
4.0
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card 
Reader Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

rfkill list

0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
1: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no

The amd64 laptop is dual-booted, Windows 10, and bluetooth still works
there.  On xubuntu I was on artful, and it worked there.

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https://bugs.launchpad.net/bugs/1764645

Title:
  Bluetooth not working

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