fyi - this issue not only on ubuntu ....

Linux bananapi 4.2.6-sunxi #1 SMP Sun Nov 29 10:33:44 CET 2015 armv7l
GNU/Linux

rfkill list
0: hci0: Bluetooth
        Soft blocked: no
        Hard blocked: no


lsusb:
Bus 003 Device 002: ID 0a5c:2101 Broadcom Corp. BCM2045 Bluetooth

hciconfig
 hci0:
        Type: BR/EDR  Bus: USB
        BD Address: 00:0B:0D:4B:74:DE  ACL MTU: 1017:8  SCO MTU: 64:8
        DOWN 
        RX bytes:2874 acl:0 sco:0 events:114 errors:0
        TX bytes:474 acl:0 sco:0 commands:114 errors:0

dmesg
[   60.281799] random: nonblocking pool is initialized
[ 2146.034156] usb 3-1: new full-speed USB device number 2 using ohci-platform
[ 2146.261191] usb 3-1: New USB device found, idVendor=0a5c, idProduct=2101
[ 2146.261221] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 2146.261240] usb 3-1: Product: Trust BT 2210 Tp 2.0 EDR
[ 2146.261256] usb 3-1: Manufacturer: Broadcom Corp
[ 2146.414281] usbcore: registered new interface driver btusb

lsmod
Module                  Size  Used by
btusb                  25039  0 
btrtl                   3603  1 btusb
btbcm                   4726  1 btusb
btintel                 1260  1 btusb
bnep                    9700  2 
bluetooth             295473  10 bnep,btbcm,btrtl,btusb,btintel
brcmfmac              158682  0 
brcmutil                4893  1 brcmfmac
realtek                 2263  0 
dwmac_sunxi             2111  0 
evdev                   9502  0 
sun4i_ts                3926  0 
phy_sun4i_usb           4138  4

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https://bugs.launchpad.net/bugs/1482914

Title:
  BCM2045 Bluetooth USB Device detected but not working

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