I'm starting to believe that this is an X detection/configuration
problem. While everything does work properly from the LiveCD, there are
"intriguing" differences between my Edgy and Feisty /etc/X11/xorg.conf
files.

My Edgy xorg.conf had

        Option          "XkbModel"      "pc104"

while the Herd1 LiveCD xorg.conf has

        Option          "XkbModel"      "pc105"
        Option          "XkbOptions"    "lv3:ralt_switch"

These are the differences; everything else is the same in the two files,
save for the comma ","  after "ATI Technologies Inc" in the Edgy
xorg.conf.

Just for fun, I made the Herd1 xorg.conf match the Edgy xorg.conf,
restarted X, and tried the installation again: Same result (black
screen, unable to see or get to the X session underneath).

BUT! In addition to the messages in gdm/:0.log reported above, the
xorg.conf had reverted to having pc105 and lv3 entries.

So I suspect some bizarre bug related to keyboard detection/management,
likely in gdm, or xorg.conf, or something else that would affect the
entire X session.

-- 
Herd1 LiveCD boots, but installer hangs after step 4
https://launchpad.net/bugs/78298

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