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bluetooth not detected in ubuntu 12.04

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http://askubuntu.com – I've got a cheap bluetooth adapter that I've been using with no problems in 10.04 for a couple of years now. I'm just trying out the 12.04 beta, and it doesn't detect any bluetooth adapters. Oddly, I also tried xubuntu 12.04 beta, and it detects the adapter just fine and works flawlessly. I'm multi-booting at this point, so there's no difference in hardware configuration. Here's the output of dmesg | grep -i blue in mainline 12.04: [ 22.243497] Bluetooth: Core ver 2.16 [ 22.243517] Bluetooth: HCI device and connection manager initialized [ 22.243519] Bluetooth: HCI socket layer init (HowTos)