[Samba] Samba4 quit working after update

[Thomas Smith]

I have multiple Samba server (different customers, separate installations)
and they've all quit working after an apparent automatic update to Ubuntu
14.04 LTS. The symptoms are identical:

   - None of the shares are browsable.
   - Authentication seems to be working, at least on the Kerberos side.
   - When running `smbclient -L localhost -UAdministrator` from the server,
   the following error is generated: "session setup failed:
   NT_STATUS_OBJECT_NAME_NOT_FOUND"
   - `id Administrator` returns the Administrator account and group
   memberships.

I'm at a bit of a lost now as to how to proceed--I've been researching now
for several hours and haven't made any headway.

Can anyone help with this please?

Thank you,

~ Tom