I'm quite new to ubuntu. I installed it sucessfully on a Laptop, and a regular PC.
I am now trying to install Ubuntu 12.04 on a hp xw9300 Workstation.

Hardware specification can be found here

I have NVIDIA Quadro NVS 280 Graphics Card.

The installer from an usb key run smoothly.

But when I boot the PC right after, I can t have a graphical display.(I just have the desktop background of Ubuntu; no tool bars). The console mode works fine.

I have the same problem with both i86 and amd64 versions of ubuntu.

The error I have:

[TTM] failed to find memory space for buffer eviction

E[Xorg[1106]] fail ttm_validate

E[Xorg[1106]] validate vram_list

E[Xorg[1106]] validate: -12

And this is repeating.

I manage to run apt-get update, apt-get upgrade from console.
I browsed the web to find answers.
If you have any idea of what could be blocking, any help will be welcome.

Reguards.