Looking at the attached information I see this.

xserver.errors:
 Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
 No surface to present from.

That indicates a messed-up video driver installation.

Also this.

UnitySupportTest: Error: command ['/usr/lib/nux/unity_support_test',
'-p', '-f'] failed with exit code 1: Error: no composite extension

Also indicates a pretty messed-up video driver installation.  This is
unlikely to be a bug in Unity, since Unity isn't even run because the
installed video driver does not support the basic functionality
required.  The attached screenshot shows Unity is not running.

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https://bugs.launchpad.net/bugs/1420889

Title:
  Desktop fails to load after login (displays tiled backgrounds)

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