[Bug 1883401] [NEW] crash due to bad custom mirror

[Mr. Jester]

Public bug reported:

I run an ubuntu mirror.  Due to a mistake in my internal firewall
configuration, the installation could not reach the mirror correctly. It
was responding on tcp/80 and redirected to an auth page.  The installer
crashed instead of gracefully failing. I submitted multiple crash
reports while troubleshooting around 10PM EDT on Jun13/2020.

** Affects: subiquity (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1883401

Title:
  crash due to bad custom mirror

Status in subiquity package in Ubuntu:
  New

Bug description:
  I run an ubuntu mirror.  Due to a mistake in my internal firewall
  configuration, the installation could not reach the mirror correctly.
  It was responding on tcp/80 and redirected to an auth page.  The
  installer crashed instead of gracefully failing. I submitted multiple
  crash reports while troubleshooting around 10PM EDT on Jun13/2020.

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