[ubuntu] X broken after 12.04->12.10 upgrade

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http://ubuntuforums.org – Back in October I attempted a 12.04->12.10 upgrade. It went almost all well but my X became broken. Now that I execute startx from the console it fails with a segfault (from /var/log/Xorg.0.log): Code: [    31.985] (II) config/udev: Adding input device ImExPS/2 Logitech Wheel Mouse (/dev/input/mouse0) [    31.985] (II) No input driver specified, ignoring this device. [    31.985] (II) This device may have been added with another device file. [    39.887] (EE) [    39.887] (EE) Backtrace: [    39.887] (EE) 0: /usr/bi (Hardware)