Here's a simple patch for this. I had some unreproducible problems that seem to be caused by the winbind_privileged directory not existing by the time chgrp is run. Could others test this?
diff -Nur ../../trunk/winbind.init debian/winbind.init --- ../../trunk/winbind.init 2006-05-31 15:32:04.000000000 +0200 +++ debian/winbind.init 2006-06-01 14:01:25.000000000 +0200 @@ -20,7 +20,8 @@ start) log_daemon_msg "Starting the Winbind daemon" "winbind" - start-stop-daemon --start --quiet --exec $DAEMON + start-stop-daemon --start --quiet --exec $DAEMON \ + && chgrp winbind /var/run/samba/winbindd_privileged/ log_end_msg $? ;; diff -Nur ../../trunk/winbind.postinst debian/winbind.postinst --- ../../trunk/winbind.postinst 1970-01-01 01:00:00.000000000 +0100 +++ debian/winbind.postinst 2006-06-01 13:16:56.000000000 +0200 @@ -0,0 +1,8 @@ +#! /bin/sh + +set -e + +getent group winbind >/dev/null 2>&1 || + addgroup --system winbind + +#DEBHELPER#

