MAAS 2.2 does not support Django 1.11, which is in Artful. This is causing the failure you are seeing. MAAS 2.3 will fix this and the first alpha wi be released next week, and will replace this package. As such, im marking this as won't fix.
** Changed in: maas (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1704538 Title: package maas-region-controller 2.2.0+bzr6054-0ubuntu2~17.04.1 failed to install/upgrade: subprocess installed pre-removal script returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/maas/+bug/1704538/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs