Install final two Ubuntu for PowerPC64 big-eddian on Power 720 (IVM):

Last Ubuntu LTS for PPC64: 16.04
Last Ubuntu in general for PPC64: 16.10

IMPORTANT: To install Ubuntu 16.10, you must install 16.04.3 from CD then upgrade to 16.10 due to yaboot bug in the 16.10 installer that will fail to boot Ubuntu once installed and rebooted.

Install Ubuntu 16.04.3 from iso:
The correct yaboot prompt command is: "install-powerpc64 console=hvsi0" (Source)

When installing. you must have ext2 /boot partition for yaboot (Source)

Also, to upgrade to 16.10, edit the /etc/apt/sources.list file and replace the old mirror with:
http://old-releases.ubuntu.com/ubuntu/
Then replace distribution name "xenial" with "yakkety"
Additionally, run "sudo apt update" and then either "sudo apt full-upgrade" or "sudo apt dist-upgrade" in a loop until fully upgraded.

Other Sources:
Gentoo wiki: PPC64 handbook: install media
Debian Ports wiki, yaboot ch6

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