Your initial comment made me smile - it was the first thing I tried.
When I realised that wouldn't work I got smarter and did

mount --bind /sys/bus/usb /proc/bus/usb

and felt mighty pleased it worked! However qmeu/kvm still couldn't find
any devices and I realised it was because in

/sys/bus/usb/devices all the device-links are relative, and begin
../../../devices Unfortunately, in the /proc/bus/usb tree that takes us
to /proc/devices which is a regular file and already exists - drat,
foiled again!

If other's can confirm this is a problem on 32-bit and 64-bit qemu and
kvm I'll post apply the patch and post an SRU debdiff.


** Changed in: qemu (Ubuntu)
   Importance: Undecided => Low
     Assignee: (unassigned) => TJ (intuitivenipple)
       Status: New => In Progress

** Changed in: kvm (Ubuntu)
   Importance: Undecided => Low
     Assignee: (unassigned) => TJ (intuitivenipple)
       Status: New => In Progress

-- 
Could not open /proc/bus/usb/devices
https://bugs.launchpad.net/bugs/156085
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