Jane: Could you also specify what's required to get those peripherals
working again. Does the machine have to be rebooted?

I'd also strongly second Brad's suggestion of trying a powered hub. A
USB port can only supply a limited amount of power, so if you have a hub
with no external power source and several bus-powered devices connected
to it there's a strong chance that you could end up with power spikes
that exceed what the USB port is capable of supplying. The fact that the
problem sometimes happens when you start a hangout is a good hint that
this is likely the case.

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https://bugs.launchpad.net/bugs/1056969

Title:
  USB accessories stop working

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