I've installed a daily Ubuntu MATE 16.04 xenial and enabled xenial-proposed. After an 'apt update' pppoeconf is now available from ubunutu-mate-desktop and ubunutu-mate-core.
@rae1939 When Ubuntu MATE 16.04.2 is released it will be included pppoeconf in the live session.
I've installed a daily Ubuntu MATE 16.04 xenial and enabled xenial-proposed. After an 'apt update' pppoeconf is now available from ubunutu- mate-desktop and ubunutu-mate-core.
@rae1939 When Ubuntu MATE 16.04.2 is released it will be included pppoeconf in the live session.