[Bug 2017806] Re: do-release-upgrade can not use apt socks5h proxy settings.

[Julian Andres Klode]

I strongly believe all our package management tools should use apt's
download support to avoid these issues; there's a lot of other stuff in
proxy management that they don't replicate, not to mention certificate
setup.

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https://bugs.launchpad.net/bugs/2017806

Title:
  do-release-upgrade can not use apt socks5h proxy settings.

Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed
Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  apt is configured to use socks5 proxy (dante):

  $ cat /etc/apt/apt.conf.d/50socks
  Acquire::http::proxy "socks5h://192.168.3.100:1080";

  apt works without problem, but do-release-upgrade fails:

  $ do-release-upgrade 
  proxy 'socks5h://192.168.3.100:1080' looks invalid
  Checking for a new Ubuntu release
  Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings

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