[Bug 1626775] [NEW] add-apt-repository incorrect error msg for ipv6

[Matthias Arnason]

Public bug reported:

If you're unable to reach either of 91.189.89.22[23], add-apt-repository
provides an error message stating that the user you provide does not
exist, regardless of whether or not it does.

While this may be rare for most users, IPv6 only networks will always
receive this misleading error message. Please consider detecting a
failure to connect and distinguishing it from successfully connecting
but receiving a negative response in the program's output.

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1626775

Title:
  add-apt-repository incorrect error msg for ipv6

Status in software-properties package in Ubuntu:
  New

Bug description:
  If you're unable to reach either of 91.189.89.22[23], add-apt-
  repository provides an error message stating that the user you provide
  does not exist, regardless of whether or not it does.

  While this may be rare for most users, IPv6 only networks will always
  receive this misleading error message. Please consider detecting a
  failure to connect and distinguishing it from successfully connecting
  but receiving a negative response in the program's output.

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