[Freeipa-users] ubuntu 16.04 freeipa-client + sssd + sudo: "policy plugin returns 0"

[Brian Candler]

It turns out we had another 16.04 machine which was working fine. But as 
soon as I updated its sudo from 1.8.16-0ubuntu1.2 to 1.8.16-0ubuntu1.3, 
it stopped working too.

So it looks like I have a reproducing case for this and I can 
investigate further - I suspect it's a behaviour change from this fix:
https://bugs.launchpad.net/ubuntu/+source/sudo/+bug/1607666