[Bug 1730672] Re: Proxy settings not applied system-wide, are not used by Software Update or apt

[daniel]

@seb128, here are some details. We don't rely on the GNOME tool. We only
have one machine and I manually added it to out Windows AD domain.
Applying the changes to the apt.conf and environment variable works but
it necessitates to insert a username a password, correct me if I'm
wrong, which I find a bit counter intuitive security wise. is there a
way to modified it so prompts the users for their password.

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https://bugs.launchpad.net/bugs/1730672

Title:
  Proxy settings not applied system-wide, are not used by Software
  Update or apt

Status in gnome-control-center package in Ubuntu:
  Confirmed
Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  The Network Proxy settings available under Settings/Network are not applied system wide. Unlike 16.x, there is no "apply system wide" setting. Setting a proxy here:
  - does not modify /etc/environment
  - does not set root's http_proxy, https_proxy, ftp_proxy environment variables 

  This means that apt and Software Updates do not receive the proxy
  settings, and package checks/updates/installs fail.

  
  workaround:

  sudo http_proxy='http://[username]:[password]@[webproxy]:[port]' apt
  update

  etc

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