I've performed a dist-upgrade with subsequent errors. After attempt to reboot, system starts at"(none) login:" where I cannot login as user or root.
I've already re-installed twice from USBstick the 5/26/12 preFull version of M12 iso.
What to do now?

Ok,
Try and purge acpi-fakekey to begin with

apt-get purge acpi-fakekey or dpkg -r acpi-fakekey

If that doesn't do anything, try this. This is a bit brutal, but it worked on my simulation.

Navigate to /var/lib/dpkg/info (as root in rox or mc) and rename the 3 acpi-fakekey postint, prerm and postrm (add a suffix like .bad to all 3) then

apt-get -f install

If you have more errors, again do

apt-get -f install

Then all seemed ok so I did

apt-get update
apt-get dist-upgrade

and more packages got installed and all ws fixed.

I've re-installed again, but this time system hangs on boot on eth0, so I've not had the chance to get to the dist-upgrade yet. Restarted router, but for whatever reason same hang on boot. Will reinstall from usbSchtick again and will try to purge acpi-fakey>apt-get -f>update>upgrade to see what happens.
Thanx for your time.

Actually it is probably best to

apt-get update
apt-get install acpi-fakekey
apt-get install irqbalance
apt-get install x11-common

(yes do them separately) then

apt-get dist-upgrade

Does it stop completely, or just use a LOT of time? Until you upgrade ifupdown, it has a very annoying"lag" at boot.

Hangs completely. Didn't on 1st 2 installs, but did on the 3rd install. I'm trying a 4th install just for the sake of futility. Then if no hang, I'll try to dist-upgrade according to your suggestions and see what happens.
Last Install I've decided to use install-2-partition instead of whole disk for install, and ext3 instead of pre-assigned ext4.
I wouldn't know how to update ifupdown without getting into the system 1st and getting a connection. __{{emoticon}}__

Neither do I, but it does have a"wait" whie booting, I was just wondering if that is what you had, or if it was something else.