NewWorld-Boot Partition wrongly selected as root partition (Lubuntu/Ubuntu MATE 16.10)
On PowerPC Apple machines with mac-partition layout a NewWorld-boot partition is needed, formatted to HFS-filesystem.
Recent Ubiquity can no longer handle this. There is no option to format a partition to HFS. Ubiquity can create a newworld-boot partition (means the boot flag is set corretly), but this partition has no filesystem and its mountpoint is also set to "/" which is wrong. You get no appropriate error message and if continued the install simply stalls infinitely.
As a workaround you need to use gparted first to appropriately create this HFS-formatted newworld-partition.
DistroRelease: Ubuntu 16.10
Package: ubiquity 16.10.13
Uname: Linux 4.8.0-21-
Date: Mon Oct 10 09:28:12 2016
InstallCmdLine: ro ramdisk_
LiveMediaBuild: Ubuntu-MATE 16.10 "Yakkety Yak" - Alpha powerpc (20161008)
PATH=(custom, no user)
UpgradeStatus: No upgrade log present (probably fresh install)