[Bug 554431] Re: Bluetooth is disabled. Pressing "Turn on bluetooth" not working

[James Valentine]

Rather than rebooting (I hate restarting my session), this worked for
me:

sudo modprobe -r btusb
sudo modprobe btusb

You might also want to try this before those commands:

sudo /etc/init.d/bluetooth restart

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Bluetooth is disabled. Pressing "Turn on bluetooth" not working
https://bugs.launchpad.net/bugs/554431
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