/etc/ppp/ip-down.d/000resolvconf is in resolvconf 1.63ubuntu11.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #!/bin/sh
#
# PPP down hook script for resolvconf
#
# Reconfigures resolver to take into account
# the disappearance of the ppp interface.
#
# This file is part of the resolvconf package.
#
[ -x /sbin/resolvconf ] || exit 0
/sbin/resolvconf -d "$PPP_IFACE"
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