Public bug reported:

Upgraded to 12.04 beta 2 64-bit, but the keyboard and mouse (both USB)
don't work. Unplugging the mouse and keyboard didn't work.

I have tried booting from an external 12.04 USB flash installation disk
to try to mount the partition and continue the upgrade but the mounted
partition contains only the following file:

EFI/ubuntu/grubx64.efi

The output of "sudo fdisk -l" follows:

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util
fdisk doesn't support GPT. Use GNU Parted.

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1   156301487    78150743+  ee  GPT

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/985015

Title:
  Upgrade to 12.04 beta 2 succeed, but no keyboard nor mouse afterwards

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