Via the GRUB "recovery" menu I was able to select "Repair packages" ...
and that ran apt-get dist-upgrade which in turn installed mesa
7.7-0ubuntu5 and now my machine boot just fine again.
** Changed in: xorg (Ubuntu)
Status: New => Fix Released
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intel drm GPU hang on every boot (before GDM) after installing lucid updates
https://bugs.launchpad.net/bugs/507590
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