This should was fixed by kde-window-manager 4:4.5.1-0ubuntu3 with the
change:
* Add kubuntu_29_fallback_to_xrender_compositing.diff
fallback to XRender compositing in case of Software Rasterizer.
(backport from trunk)
** Changed in: xserver-xorg-video-nouveau (Ubuntu)
Status: New => Fix Released
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KDE does not start; thrown back to login screen
https://bugs.launchpad.net/bugs/638817
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