When the screen stays blank, ubuntu is not completely frozen : if I push
the power button (without holding it), the hard disk flashes a few
seconds and then it powers down : looks like a proper shutdown

I found a temporary workaround by adding startup parameters in grub :
if I add "nouveau.modeset=0 nouveau.noaccel=1 blacklist=vga16fb", the desktop 
appears properly and ubuntu seems to work fine.

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Regression : no image when starting lucid beta 2, with Nvidia Geforce6200 
NV44A. "Error referencing VRAM ctxdma: -12". Worked in alpha 3 and in karmic
https://bugs.launchpad.net/bugs/564617
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