These messages:
Failed to preset unit: Unit file /etc/systemd/system/samba-ad-dc.service is 
masked.
/usr/bin/deb-systemd-helper: error: systemctl preset failed on 
samba-ad-dc.service: No such file or directory

Are not fatal. Look at the "|| true" ending of all those calls:
deb-systemd-helper unmask samba-ad-dc.service >/dev/null || true

# was-enabled defaults to true, so new installations run enable.
if deb-systemd-helper --quiet was-enabled samba-ad-dc.service; then
        # Enables the unit on first installation, creates new
        # symlinks on upgrades if the unit file has changed.
        deb-systemd-helper enable samba-ad-dc.service >/dev/null || true
else
        # Update the statefile to add new symlinks (if any), which need to be
        # cleaned up on purge. Also remove old symlinks.
        deb-systemd-helper update-state samba-ad-dc.service >/dev/null || true
fi

It's confusing, and the upstream "fix" was to just echo a message asking
the administrator to ignore the error, which is a bit unfortunate:

https://anonscm.debian.org/cgit/pkg-
samba/samba.git/commit/?id=61eaeba2a7a2df61b681b4ea545811569de421d0

So back to the bug at hand.

Do you still have a crash happening, and if yes could you provide us with these 
files:
- /var/log/syslog
- /var/log/samba/log*
- /etc/samba/smb.conf

Then we can change the subject line of this bug and go from there.

** Changed in: samba (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1658273

Title:
  Failed to preset unit: Unit file /etc/systemd/system/samba-ad-
  dc.service is masked.

Status in samba package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  On a standalone desktop running zesty with a gnome-shell session, when
  upgrading the samba packages, i get:

  Setting up samba (2:4.4.5+dfsg-2ubuntu7) ...
  Failed to preset unit: Unit file /etc/systemd/system/samba-ad-dc.service is 
masked.
  /usr/bin/deb-systemd-helper: error: systemctl preset failed on 
samba-ad-dc.service: No such file or directory

  note: ubuntu-bug ask questions about a possible windows relationship,
  but there is no option for a standalone system like that one; so as
  samba is installed to satisfy qemu, these questions completly ignore
  such case and send inappropriate report.

  .... and smbd still crashing on cold boot ( lp:1658293 ) (standalone
  desktop)

  note2: a more recent Debian version seems workaround that output:
  samba (2:4.4.5+dfsg-3)
  [ Mathieu Parent ]
    * Remove /etc/systemd/system/samba-ad-dc.service (from postinst) on purge.
      Closes: #832352
  and samba (2:4.4.6+dfsg-1)
  Only fix PIDFile in {nmbd,samba-ad-dc,smbd,winbind}.service (i.e. not
      ctdb.service) Closes: #838000.
  and samba (2:4.4.6+dfsg-2) 
    * Remove uses of tevent internals. This fixes segfault.
      Closes: #840382, #840298.
  
http://metadata.ftp-master.debian.org/changelogs/main/s/samba/samba_4.5.2+dfsg-2_changelog

  ... time to get package synced

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