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[larry2rock <coleld@xxxxxxxxxxx>]

My related problem was that GRUB2 would not recognize a USB keyboard.
I discovered a BIOS setting for USB keyboard support (document says for  DOS mode) that was Disabled by default.  Enabling that feature fixed my problem.

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https://bugs.launchpad.net/bugs/990870

Title:
  External USB keyboard not working in Ubuntu 12.04

Status in “linux” package in Ubuntu:
  Fix Released

Bug description:
  Recently upgraded my Ubuntu 11.10 installation to 12.04 on my ThinkPad
  T400. I use dm-crypt which asks for password at boot. External USB
  keyboards will not work to type the password in. I must use the
  keyboard on the laptop itself, which is a problem since I use a
  docking station.

  The USB keyboard works after I get into the GUI if I unplug it and
  plug it back in. I already ran a 'dpkg --configure -a' and a 'dpkg-
  reconfigure -a', with no luck.

  I installed a fresh copy of 12.04 on the same system and have the same
  exact issue.

  Let me know what debugging info you need, as well as how to retrieve
  it. This seems to be a serious bug that others are experiencing on
  other hardware platforms.

  Kernel is 3.2.0-24.37-generic

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