I am seeing the same problem when trying to edit an interface for a recently commissioned machine. The stack trace from the reporter is the same for me as well.
Running maas 2.7.0-8232-g.6e1dba4ab-0ubuntu1~18.04.1 from the ubuntu PPA http://ppa.launchpad.net/maas/2.7/ubuntu
I am seeing the same problem when trying to edit an interface for a recently commissioned machine. The stack trace from the reporter is the same for me as well.
Running maas 2.7.0-8232- g.6e1dba4ab- 0ubuntu1~ 18.04.1 from the ubuntu PPA http:// ppa.launchpad. net/maas/ 2.7/ubuntu