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The following is the Unity test output:

OpenGL vendor string:   NVIDIA Corporation
OpenGL renderer string: GeForce FX 5500/AGP/SSE2
OpenGL version string:  2.1.2 NVIDIA 173.14.30

Not software rendered:    yes
Not blacklisted:          no
GLX fbconfig:             yes
GLX texture from pixmap:  yes
GL npot or rect textures: yes
GL vertex program:        yes
GL fragment program:      yes
GL vertex buffer object:  yes
GL framebuffer object:    yes
GL version is 1.4+:       yes

Unity supported:          no

As you can see, all requirements are fulfilled but my GPU is blacklisted. What can I do about it?

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up vote 2 down vote accepted

I had the same problem with my Geforce FX 5700, with Unity not starting on Ubuntu 11.04. I found a fix here (and this was my topic). Now I'm running in Ubuntu Classic (including effects) without problems.

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I am already running Ubuntu Classic with effects, but Unity does not work. – Oxwivi Jun 27 '11 at 12:54
No icons in launcher (though I didn't reboot yet), but I can live with it. – Oxwivi Jun 27 '11 at 13:19

FX cards seem to be blacklisted:

  // jaytaoko: Balcklist the Geforce FX cards
  if (results->renderer != NULL) {
    char* str = strstr (results->renderer, "GeForce FX");
    if (str != NULL) {
      results->flags |= FLAG_BLACKLISTED;

Here's the reason why:

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