I have not looked at the detection code but it might be possible to use
"ss" instead of lsof to detect if anything listens on a given port. "ss"
comes from iproute2 so it's more widely available.

  $ ss -nto state listening 'sport = 80'
  Recv-Q Send-Q          Local Address:Port                         Peer 
Address:Port
  0      0                           *:80                                      
*:*
  0      0                          :::80                                     
:::*


I tried suppressing the header with "-H/--no-header" but ss segfaults but 
that's for another LP :)

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https://bugs.launchpad.net/bugs/1782226

Title:
  Allow NGINX to install but not start during postinst if another
  process is bound to port 80

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