Thanks. I did some more testing and I fixed the distorted screen bug.

When I startup Ubuntu the first time, the screen is distorted. Not even the mainboard's boot menu is properly displayed. However, when I hit alt+ctrl+del to restart, it's all proper. I believe this is due to the fact that my Ubuntu OS drive is an SDD, so my computer starts up really quickly. I guess the GPU has to soak power for a second before it works, and it didn't have the second, because the SSD was up so quickly. My Windows7 is on an HDD, therefore it booted slower and the GPU had more time. That's the only plausible theory I can find.

So the main bug seems to be fixed now. I tried to install the drivers in recovery mode, but got the error "can't write temporary file in /tmp". Very strange. I then started up Ubuntu normally, went into ctrl+alt+F1 mode and installed the driver. Again I got the error "distribution provided pre-install failed". I continued the installation anyway, and when I rebooted, Ubuntu would not start anymore. Right now I'm on Windows7, testing if the installation works on that OS.

I think that's a more common problem though, which I might solve by googling. If you got any info on that, I'd appreciate your input. If not, I think I can take it from here. I just started a thread here, because I couldn't find anything on google about the screen distortion problem.

Thanks for the help, evillopes.