I've been bitten by this also on a new install, exhibiting exactly the
same blank desktop with no icons, side launcher or top panel.
My gfx hardware is an Intel 855GM (not an 865 but is of the same
generation chipset).
The OpenGL failure (Root visual is not a GL visual) and the resulting
compiz opengl plugin failure is due to the intel driver defaulting to
the new 'sna' (Sandybridge) renderer.
This generation of intel gfx cards needs the old 'uxa' renderer and so
needs to be manually set in xorg.conf.d entry like so:
# cat /etc/X11/xorg.conf.d/20-intel.conf
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "uxa"
EndSection
That should give you a very slow but working software rendered Unity desktop.
It's debatable, but this slow desktop performance is probably unacceptable for
everyday use.
The card only supports up to OpenGL-1.3 and Unity3D needs OpenGL-1.4+
which is why it falls back to software render.
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https://bugs.launchpad.net/bugs/1212821
Title:
Unity fails to load on old hardware on Saucy
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