Thanks. So this keeps looping on

apr 09 01:41:57 hostname kernel: usb 1-3: new high-speed USB device number 2 
using xhci_hcd
apr 09 01:41:57 hostname kernel: usb 1-3: device descriptor read/all, error -110

but doesn't say which kind of device that is as it can't talk to it.

Is this a regression in 15.04? You have upgraded this machine for a long
time, so you might still have some older kernels around (from 14.04 LTS
or 14.10). You might try booting those from the GRUB boot menu and see
if that helps?

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1437492

Title:
  boot stalls on USB detection errors

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