Comment 1 for bug 1748280

This looks like breaking autopkgtest, at least for unattended-upgrades:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/arm64/u/unattended-upgrades/20180213_054128_4e1c0@/log.gz
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autopkgtest [05:40:32]: test test-systemd.py: [-----------------------
bash: line 1: 5110 Killed /tmp/autopkgtest.wwbI8q/build.hcW/src/debian/tests/test-systemd.py 2> >(tee -a /tmp/autopkgtest.wwbI8q/test-systemd.py-stderr >&2) > >(tee -a /tmp/autopkgtest.wwbI8q/test-systemd.py-stdout)
autopkgtest [05:40:32]: test process requested reboot with marker InstallOnShutdown
autopkgtest-virt-ssh: WARNING: ssh connection failed. Retrying in 3 seconds...
File missing : /var/log/unattended-upgrades/unattended-upgrades.log
InstallOnShutdown did not run
autopkgtest [05:41:03]: test test-systemd.py: -----------------------]
autopkgtest [05:41:04]: test test-systemd.py: - - - - - - - - - - results - - - - - - - - - -
test-systemd.py FAIL non-zero exit status 1
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