[Bug 1447294] Re: package nginx-full 1.6.2-5ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Francis De Brabandere]

systemctl status nginx.service
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2015-05-07 10:47:47 EDT; 8min ago
  Process: 540 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

then I tried 
sudo /usr/sbin/nginx -t -q -g "daemon on; master_process on;"

and
sudo tail -n 100 /var/log/nginx/error.log

which revealed
2015/05/07 10:47:47 [emerg] 540#0: host not found in upstream "localhost:8080" in /etc/nginx/sites-enabled/foo.bar.com:2

but strangely this one seems to work
sudo service nginx start

any clues?

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Title:
  package nginx-full 1.6.2-5ubuntu3 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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