[Bug 1789097] Re: winbind does not work after reboot on Mint 19 / Ubuntu 18.04

[Andreas Hasenack]

Ah, and that's only in the "no wins specified" case, otherwise it
recovers just fine.

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Title:
  winbind does not work after reboot on Mint 19 / Ubuntu 18.04

Status in samba package in Ubuntu:
  Triaged

Bug description:
  [copied from the Linux Mint forum]

  Just installed Mint 19 and noticed a WINS name resolution buglet. I
  assume this applies to Ubuntu 18.04 as well.

  Windows, i.e., NetBIOS, name resolution is on Linux provided for by
  the "winbindd" daemon, part of the Samba suite. One does not need
  either of the other two Samba daemons "smbd" and "nmbd" when NetBIOS
  name resolution is all you need: sudo apt-get install libnss-winbind
  (which additionally pulls in "winbind" itself) and adding "wins"
  before "dns" to the "hosts" line of /etc/nsswitch.conf is enough.

  While this works fine directly after installation it does no more
  after reboot due to a systemd unit file dependency issue. The standard
  /lib/systemd/system/winbind.service orders itself after
  "network.target" and "nmbd.service" which if you do not in fact have
  "samba" hence "nmbd.service" installed amounts to "network.target"
  only. It however needs "network-online.target" -- itself a dependency
  of "smbd.service" if you do have that installed as well.

  You can solve things by copying the unit file to its corresponding
  directory under /etc and editing it,

    sudo cp /{lib,etc}/systemd/system/winbind.service
    xed admin:/etc/systemd/system/winbind.service

  to change the line

    After=network.target nmbd.service

  to the two lines

    After=network-online.target nmbd.service
    Wants=network-online.target

  After save and reboot you will have NetBIOS name resolution functional
  without all of the rest of Samba running.

  Note that although this fix is not needed when you do have "samba"
  itself installed the above is still fine also the

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