utopic uefi bootx64.efi not loading grubx64.efi

Booting a UEFI machine on 1.7beta8 on Utopic fails to load the grubx64.efi image. The TFTP server complains about unknown error code 8. If you deploy 1.7beta8 on trusty it works as expected.

2014-10-28 15:34:19-0400 [TFTP (UDP)] Datagram received from ('192.168.122.10', 1284): <RRQDatagram(filename=bootx64.efi, mode=octet, options={'tsize': '0', 'blksize': '1468'})>
2014-10-28 15:34:19-0400 [TFTP (UDP)] Datagram received from ('192.168.122.10', 1284): <RRQDatagram(filename=bootx64.efi, mode=octet, options={'tsize': '0', 'blksize': '1468'})>
2014-10-28 15:34:19-0400 [-] RemoteOriginReadSession starting on 57963
2014-10-28 15:34:19-0400 [-] RemoteOriginReadSession starting on 57963
2014-10-28 15:34:19-0400 [-] Starting protocol <tftp.bootstrap.RemoteOriginReadSession instance at 0x7fc06c14c3b0>
2014-10-28 15:34:19-0400 [-] Starting protocol <tftp.bootstrap.RemoteOriginReadSession instance at 0x7fc06c14c3b0>
2014-10-28 15:34:19-0400 [RemoteOriginReadSession (UDP)] Unhandled Error
 Traceback (most recent call last):
   File "/usr/lib/python2.7/dist-packages/twisted/python/log.py", line 73, in callWithContext
     return context.call({ILogContext: newCtx}, func, *args, **kw)
   File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 118, in callWithContext
     return self.currentContext().callWithContext(ctx, func, *args, **kw)
   File "/usr/lib/python2.7/dist-packages/twisted/python/context.py", line 81, in callWithContext
     return func(*args,**kw)
   File "/usr/lib/python2.7/dist-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
     why = selectable.doRead()
 --- <exception caught here> ---
   File "/usr/lib/python2.7/dist-packages/twisted/internet/udp.py", line 246, in doRead
     self.protocol.datagramReceived(data, addr)
   File "/usr/lib/python2.7/dist-packages/tftp/bootstrap.py", line 171, in datagramReceived
     datagram = TFTPDatagramFactory(*split_opcode(datagram))
   File "/usr/lib/python2.7/dist-packages/tftp/datagram.py", line 394, in __call__
     return datagram_class.from_wire(payload)
   File "/usr/lib/python2.7/dist-packages/tftp/datagram.py", line 323, in from_wire
     raise InvalidErrorcodeError(errorcode)
 tftp.errors.InvalidErrorcodeError: Unknown error code: 8