Comment 2 for bug 1691218

Same problem here, using pxelinux 6.03 as of 16.04.

I initially thought that it failed at an earlier PXE stage, as it alway
booted to the local hard disk (exiting PXE), but that was only due to a
'default harddisk' within the configuration:

--------------------------------
default harddisk
timeout 300
prompt 1

label harddisk
  localboot 0

label netboot
  kernel ...
  ...
--------------------------------

Booting into 'netboot' worked well if specified as 'default netboot', but again,
it would always select that default, regardless of prompt input.