[Bug 2060897] Re: Xubuntu installation failed: RuntimeError: aborting install since no mirror is usable

[Dan Bungert]

So this outcome is not limited to xubuntu.  I was able to produce the
same result with the base desktop ISO as well.

The key here is a "deadnet" type configuration - active networking but not going anywhere.
I was however able to make the install work on the deadnet by setting the autoinstall policy 
apt: {fallback: offline-install}

The code equivalent of that is a proof-of-concept that I think is
overdue to make real, in
https://github.com/canonical/subiquity/pull/1816, except I think server
wants this default also and that PR applies this policy value change to
desktop.

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https://bugs.launchpad.net/bugs/2060897

Title:
  Xubuntu installation failed: RuntimeError: aborting install since no
  mirror is usable

Status in subiquity:
  New
Status in ubuntu-desktop-provision:
  New
Status in subiquity package in Ubuntu:
  Confirmed

Bug description:
  Xubuntu 24.04 with the new Flutter installer. ISO 20240410.1

  Installation failed with log:

  RuntimeError: aborting install since no mirror is usable

  See attached installer logs folder.

  The installation took place in a VirtualBox VM. The network was
  seemingly not configured correctly, so web browsing didn't work until
  after the installation when I switched the adapter from NAT to Bridged
  and restarted the network.

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