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

[Julian Andres Klode]

I've been considering lowering the timeout in apt from 120s to something
like 10-30s for a year or two, but there's been some concern about high-
latency connections. I personally do not think that 120s is a sensible
timeout for one round trip.

There are also several options to prevent this issue on the network
side:

- do not provide DNS servers / resolve internet names
- do not drop packets, but reject them
- point a SRV record in your DNS server to a working HTTP host (either serving the archive, or 404, as long as it connects, it should be fine)

We also had the same issue on some IPv6+IPv4 systems where the IPv6 is
not reachable, but that's fixed in cosmic with happy eyeballs falling
back to the next host within milliseconds (trying more and more hosts in
parallel until one works).

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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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