This issue occurred in 16.10 and is supposedly fixed in 17.04. No confirmation of this has occurred, but 17.04 is due to be EoL in just a few days and yaboot is not available beyond 17.04. That said, I'm going to to call it Won't Fix.
** Changed in: yaboot (Ubuntu) Status: Confirmed => Won't Fix -- You received this bug notification because you are a member of Ubuntu PowerPC Architecture Team, which is subscribed to yaboot in Ubuntu. https://bugs.launchpad.net/bugs/1606089 Title: unable to boot after 'entire disk' install (16.10, ppc) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/yaboot/+bug/1606089/+subscriptions -- Mailing list: https://launchpad.net/~ubuntu-powerpc Post to : ubuntu-powerpc@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-powerpc More help : https://help.launchpad.net/ListHelp