Wendy, Could you please try the installer in -proposed ?
http://ports.ubuntu.com/dists/xenial-proposed/main/installer-ppc64el/current/images/hwe-netboot/
Wendy, Could you please try the installer in -proposed ?
http:// ports.ubuntu. com/dists/ xenial- proposed/ main/installer- ppc64el/ current/ images/ hwe-netboot/