[xubuntu] Installer GUI is not usable

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http://ubuntuforums.org – Is there a "safe mode" or similar in the installer? I'm trying to install Xubuntu 12.10 (x86) and can't get to a working GUI. I get a very nice cool blue looking XFCE splash screen for a while, then that gies away and I get a very unwell looking pattern on the screen that just sticks that way. See attached image. Ctrl-Alt-F1 gets me a console where I can see error messages like this streaming past... [drm] nouveau 0000:05:000: PFIFO_CACHE_ERROR - ch 2/2 Mthd 0x860 Data xxxxxx the data is changing constantly. My video card is: VGA compatible controller: NVIDIA Corporation G92 [G (Hardware)