Looks like this is some actual regression somewhere. systemd-resolved's
ExecStartPost fails to start:

  Process: 4728 ExecStartPost=/bin/sh -c [ ! -e /run/resolvconf/enable-
updates ] || echo "nameserver 127.0.0.53" | /sbin/resolvconf -a systemd-
resolved (code=exited, status=127)


Aug 15 07:16:39 autopkgtest sh[4659]: sed: error while loading shared 
libraries: cannot restore segment prot after reloc: Operation not permitted
Aug 15 07:16:39 autopkgtest sh[4659]: sed: error while loading shared 
libraries: cannot restore segment prot after reloc: Operation not permitted

In 231, several units got some privilege reduction:

  MemoryDenyWriteExecute=yes
  SystemCallFilter=~@clock @cpu-emulation @debug @keyring @module @mount 
@obsolete @raw-io

Apparently the former upsets sed (which is called by resolvconf) on
ppc64el. So we need to disable the privilege reduction for
/lib/systemd/system/systemd-resolved.service.d/resolvconf.conf

** Changed in: systemd (Ubuntu)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1609740

Title:
  please investigate ppc64el networkd-test.py failure

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