ruediger.kupper:
Acceleration check can be skipped by passing  --disable-acceleration-check to 
gnome-session

chris-good:
I might be wrong but by 3D acceleration, VM hypervizors usually mean H/W 3D 
offloading to host GPU.
Also usually VM para-virtualized drivers support direct rendering and all most 
X11 extensions which can be used by Mesa (pure software or LLVM-pipe) to 
simulate 3D.
Regarding Unity, it uses Compiz which also supports Mesa simulated 3D (at least 
in recent versions).
Environments like NX/VNC/RDP and etc, usually lack direct rendering and most 
X11 extensions therefor 3D simulation is broken.
It's sad that this fact is ignored by distributions and desktop environments 
developers and we are enforced to deal with it here :-(

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Desktop Bugs, which is subscribed to gnome-session in Ubuntu.
https://bugs.launchpad.net/bugs/1251281

Title:
  gnome-session-flashback fails to start without hardware acceleration
  in cloud/remote environments (Forwarded-X/XRDP/VNC/NX/X2GO/Chromoting)

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