Comment 3 for bug 763457

I have no idea if this is considered a proper workaround but it "works for me":
Downloaded the .deb from a mirror and edited it according to this (removed nvidia-current)
http://blog.sch.bme.hu/index.php/aldaris/2010/10/13/how-to-workaround-apt-get-unmet-dependencies-error
Then installed it with # dpkg -i fixed-pyopencl.deb

I went through all the apt-get flags but none would let me install it without also pulling the nvidia-current.

This is a pretty bad bug because when I installed python-pyopencl and rebooted on my AMD/ATI system I got a blank screen, no VCs, no errors in Xorg log and the hidden GRUB wasn't very helful either. Reboot, live CD, chroot :(
I discovered what was going on by reinstalling everything and rebooting after every graphic related change.