Your Dpkg logs show this is abundant in your nginx error logs:
apr 23 09:48:26 servertest nginx[4953]: nginx: [emerg] bind() to 0.0.0.0:80
failed (98: Address already in use)
apr 23 09:48:26 servertest nginx[4953]: nginx: [emerg] bind() to [::]:80 failed
(98: Address already in use)
This means something else is listening on port 80 on your system. You
need to turn off any other web-servers you have first, then attempt to
install NGINX (or run `apt-get install -f` to process the data again and
to properly reconfigure/install nginx)
** Changed in: nginx (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1766523
Title:
package nginx-core 1.10.3-0ubuntu0.16.04.2 failed to install/upgrade:
le sous-processus script post-installation installé a retourné une
erreur de sortie d'état 1
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