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samba4 stopped working

I've been using Samba4 on Debian/Jessie since it became "stable". After the last upgrade however, I got a massive failure.
The first symptom I noticed was that I couldn't grab updates from the Debian servers. However when clients tried to log in, the real problem revealed itself. They could only log on using a temporary profile and couldn't connect to any of the shares or printers. 

When I test my implementation of Samba, it fails the basic test:

# smbclient -L localhost -U%
Connection to localhost failed (Error NT_STATUS_CONNECTION_REFUSED)

The globals section of smb.conf is:

[global]
        workgroup = DENTALOFFICE
        realm = DENTALOFFICE.ROSSLAND.DENTAL
        netbios name = MOLAR
        server role = active directory domain controller
        dns forwarder = 8.8.8.8
        idmap_ldb:use rfc2307 = yes
        allow dns updates = nonsecure
which explains why I can't get to the Debian servers. The hand off to Google's DNS servers never happens.
ps aux | grep nmbd, smbd or samba all show that samba isn't running. The logs for starting samba show:
[2016/07/04 11:29:48.240042, 0] ../source4/smbd/server.c:370(binary_smbd_main) 
  samba version 4.2.10-Debian started.
  Copyright Andrew Tridgell and the Samba Team 1992-2014
[2016/07/04 11:29:48.421540, 0] ../source4/smbd/server.c:488(binary_smbd_main) 
  samba: using 'standard' process model
samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. [2016/07/04 11:29:48.446253, 0] ../lib/util/become_daemon.c:124(daemon_ready) 
  STATUS=daemon 'samba' finished starting up and ready to serve connections
samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. samba: setproctitle not initialized, please either call setproctitle_init() or link against libbsd-ctor. [2016/07/04 11:29:48.460701, 0] ../lib/util/util_runcmd.c:324(samba_runcmd_io_handler) 
  /usr/sbin/winbindd: Failed to exec child - No such file or directory
[2016/07/04 11:29:48.462580, 0] ../source4/winbind/winbindd.c:49(winbindd_done) 
  winbindd daemon exited normally
task_server_terminate: [winbindd child process exited]
[2016/07/04 11:29:48.464159, 0] ../source4/smbd/server.c:211(samba_terminate) 
  samba_terminate: winbindd child process exited
Although the message about the daemon being ready seems to indicate that samba is running, as I said, ps aux shows that it isn't.
Any ideas how I can get Samba back up? Uninstalling and reinstalling it didn't work.
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