Installation completed with a workaround that I will document below.

This bug can be summarized in two parts.

-=-=-

#1) GUI Installer crashed with black screen at start of unpacking phase.
Had to reboot.

Unsolved mystery.

-=-=-

#2) Running `sudo apt-get dist-upgrade` gave an error. Workaround
provided by link in comment #3.

$ sudo nano -w /usr/lib/python2.7/sre_constants.py

Look for:
  from _sre import MAXREPEAT

Replace with:
  MAXREPEAT = 65535
  #from _sre import MAXREPEAT

$ sudo nano -w /usr/lib/python2.7/sre_constants.py
$ nano -w /usr/lib/python2.7/sre_parse.py

Look for:
 from _sre import MAXREPEAT

Replace with:
 #from _sre import MAXREPEAT

-=-=-

Hope this helps someone.

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https://bugs.launchpad.net/bugs/1165281

Title:
  12.10 to 13.04  Failed, Now Get "An upgrade from raring to quantal is
  not supported with this tool"

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