[Bug 1766542] Re: Installation blocks when the machine is behind a proxy server

[Robert Liu]

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

Status in OEM Priority Project:
  Confirmed
Status in apt package in Ubuntu:
  New
Status in ubiquity package in Ubuntu:
  Incomplete
Status in apt source package in Bionic:
  New
Status in ubiquity source package in Bionic:
  New

Bug description:
  When the machine is behind a proxy server, the installation will block
  for a while (several minutes) to retrieve the package lists. The
  timeouts are too long and makes user feels the machine may have some
  problems.

  The symptom is similar with bug #14599, but it seems the apt-setup
  module was rewritten.

  Another method to trigger this issue is to make the machine cannot
  access to the Internet, for instance: a wrong gateway.

  Image: 16.04

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