SDL support missing from qemu-1:3.1+dfsg-2ubuntu3.1

qemu support is missing from qemu-1:3.1+dfsg-2ubuntu3.1 on Disco. This is dispite qemu --help saying its available. SDL support is needed to use Packer(https://www.packer.io/) in graphical mode.

# qemu-system-x86_64 -cpu host -smp 2,sockets=2,cores=1,threads=1 -machine type=pc,accel=kvm -display sdl -cdrom ubuntu.iso
qemu-system-x86_64: Display 'sdl' is not available.

# qemu-system-x86_64 --help | grep sdl
-display sdl[,frame=on|off][,alt_grab=on|off][,ctrl_grab=on|off]
-sdl            shorthand for -display sdl