Comment 7 for bug 1511497

Tested 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