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[64 bit] installing 12.10 from ISO USB stick - graphics driver problem

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http://ubuntuforums.org – Hi, I am attempting to install Ubuntu 12.10 64-bit desktop from the install ISO on a USB stick to an HP 8540w laptop. The installer boots and shows the purple ubuntu splash screen with the loading progress indicator. However, when it gets to the part where I would expect the graphical installer interface to be displayed the screen gets corrupted (mostly white with a scattering of geometric hash patterns). After a while it falls back to a text screen that gives some error messages like: [drm] nouveau ... Failed to idle channel 2 [drm] nouveau ... PGRAPH TLB flush idle timeout fail: ... Then (Hardware)