[Samba] Samba4 quit working after update

[Sketch]

On Tue, 19 Apr 2016, Thomas Smith wrote:

>>>>> Upgrade: python-samba:amd64 (4.1.6+dfsg-1ubuntu2.14.04.13,
>>>>> 4.3.8+dfsg-0ubuntu0.14.04.2)
>
> The server's been operational for months without winbind. Did something
> change in Samba that it won't operate now without it?
>
> I specifically remember reading that winbind wasn't necessary and, in fact,
> wasn't recommended with Samba 4 AD.

That was the case with Samba 4.1, which it looks like you just upgraded 
from.  Samba 4.1 had it's own internal winbind service.  I believe 4.2 is 
when the standalone winbindd introduced support for DCs.