Comment 4 for bug 1524366

Tested amd64 image successfully using roughly what is in 'notes.txt' at
 https://gist.github.com/smoser/1057704

The provided preseed does unattended install and sets 'ubuntu' user with 'ubuntu' password.

Kernels used:
 $ md5sum kernel initrd
 6725de97b08c3a79ef367d8a8d45b925 kernel
 66ccbff804a89bca2ff23dd7c62e0b04 initrd
 $ ls -l kernel initrd
 $ ls -l kernel initrd
 -rw-rw-r-- 1 ubuntu ubuntu 22544400 Dec 9 20:49 initrd
 -rw-rw-r-- 1 ubuntu ubuntu 6708504 Dec 9 20:49 kernel

Install done with:
 qemu-system-x86_64 -enable-kvm -m 1024 -curses -device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 -drive if=virtio,file=disk.img,cache=unsafe -no-reboot -kernel kernel -initrd initrd -append "apt-setup/proposed=true nomodeset fb=false priority=critical locale=en_US url=http://10.245.168.15:9900/preseed"

After booting, system shows:
 $ lsb_release -sc
 trusty
 $ uname -r
 4.2.0-22-generic
 $ dpkg -S /boot/vmlinu?-$(uname -r)
 linux-image-4.2.0-22-generic: /boot/vmlinuz-4.2.0-22-generic

Same process for i386 images currently at -proposed.
 $ md5sum kernel initrd
 21e31eaae6a3fb26b9ad26ca472db3ee kernel
 c161d6fc793cc8c34cd593e5ab34615a initrd
 $ ls -l kernel initrd
 -rw-rw-r-- 1 ubuntu ubuntu 20707800 Dec 9 20:48 initrd
 -rw-rw-r-- 1 ubuntu ubuntu 6420992 Dec 9 20:48 kernel

Install done with:
  qemu-system-i386 -enable-kvm -m 1024 -curses -device virtio-net-pci,netdev=net00 -netdev type=user,id=net00 -drive if=virtio,file=disk.img,cache=unsafe -no-reboot -kernel kernel -initrd initrd -append "apt-setup/proposed=true nomodeset fb=false priority=critical locale=en_US url=http://10.245.168.15:9900/preseed"

Booted system, logged in then:
 $ lsb_release -sc
 trusty
 $ uname -r
 4.2.0-22-generic
 $ dpkg -S /boot/vmlinu?-$(uname -r)
 linux-image-4.2.0-22-generic: /boot/vmlinuz-4.2.0-22-generic
 $ uname -m
 i686