Comment 3 for bug 1577554

The workaround of copying ldlinux.c32 does not work. The problem as documented upstream in http://www.syslinux.org/archives/2015-September/024305.html still exists; see below my configuration*.

What happens after copying ldlinux.c32 to /tftpboot:
- the system attempts to execute the default boot option from the pxelinux.cfg/default menu, no matter what I type at the boot prompt
- if I make booting a kernel over http the default option, boot fails with the message:
"Loading http:////nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux... failed: No such file or directory" (no matter what I type at the boot prompt)

What happens after removing /tftpboot/ldlinux.c32 and copying gpxeboot.0 from an ubuntu 14.04 machine:
- system boots as expected.

*) I'm using the following config:
Ubuntu release:
Description: Ubuntu 16.04.2 LTS
Release: 16.04
pxelinux:
  Installed: 3:6.03+dfsg-11ubuntu1

- dnsmasq:
dhcp-boot=gpxelinux.0
enable-tftp
tftp-root=/tftpboot
log-dhcp

dhcp-range=10.38.18.10,10.38.18.100
- /tftpboot/gpxelinux.0 copied from /usr/lib/PXELINUX/gpxelinux.0
- /tftpboot/pxelinux.cfg/default:
DEFAULT l

LABEL l
        localboot 0

prompt 1
timeout 1200

LABEL xenial64
 kernel http://nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux
 append initrd=http://nl.archive.ubuntu.com/ubuntu/dists/xenial/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/initrd.gz ramdisk_size=16432 root=/dev/rd/0 rw console-setup/ask_detect=false console-setup/layoutcode=us debian-installer/locale=en_US.UTF-8 debconf/priority=critical --