>From the log (whicih doesn't hold much more useful data I could see):
See "systemctl status nginx.service"
What is that reporting?
On an upgrade it needs to restart the server, if the config is broken the
upgrade will not work.
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package nginx-core 1.10.0-0ubuntu0.16.04.4 failed to install/upgrade:
subprocess installed post-installation script returned error exit
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