Here is how I setup the environment:
1. prepare a broadband gateway. This time I use LEDE with VirtualBox. I can 
upload the VM image if necessary.
2. add a firewall rule on the gateway: all http/https traffic from LAN port 
will be redirected to a IP which is not used by any machine.
3. install Ubuntu and check the behavior.

I can reproduce the issue with this environment. Even though, I'm not
sure if this is exactly the same with the customer's environment.

@Steve, Yes, We are using oem-config mode. With the normal mode, because
it uses less archives and apt operations, the blocking time is shorter.
Please see my following comments, I'll provide my results of the
official 16.04 and 18.04 image.

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https://bugs.launchpad.net/bugs/1766542

Title:
  Installation blocks when the machine is behind a proxy server

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