Comment 30 for bug 660405

If anyone is after a get-around while waiting for a fix, this works for me ...

In /etc/X11/, copy xorg.conf.failsafe to xorg.conf
I understand that this causes Ubuntu to use a old lower-functionality 'vesa' driver.

Some of the xorg.conf file ..
Section "Device"
 Identifier "Configured Video Device"
 Driver "vesa"
EndSection
  : :

(This may not be necessary ? ..)
I also modified a line in /etc/default/grub, adding the 'nomodeset' option ..
GRUB_CMDLINE_LINUX_DEFAULT="quiet nosplash nomodeset"
and ran
sudo update-grub

My system is stable using this driver, but I can't use Google Earth because this driver gives too low performance.