This bug was fixed in the package livecd-rootfs - 2.447
--------------- livecd-rootfs (2.447) artful; urgency=medium
* Add cm3 as a known ubuntu-core image type. LP: #1698223.
-- Steve Langasek <email address hidden> Thu, 15 Jun 2017 23:36:44 -0700
This bug was fixed in the package livecd-rootfs - 2.447
---------------
livecd-rootfs (2.447) artful; urgency=medium
* Add cm3 as a known ubuntu-core image type. LP: #1698223.
-- Steve Langasek <email address hidden> Thu, 15 Jun 2017 23:36:44 -0700