Gathering information about your system...
Distribution: Ubuntu 8.04
Desktop environment: GNOME
Graphics chip: nVidia Corporation C51 [Geforce 6150 Go] (rev a2)
Driver in use: nvidia
Rendering method: Nvidia
Checking if it's possible to run Compiz on your system...
Checking for texture_from_pixmap... [ OK ]
Checking for non power of two support... [ OK ]
Checking for composite extension... [ OK ]
Checking for FBConfig... [ OK ]
Checking for hardware/setup problems... [SKIP]
At least one check had to be skipped:
Error: Couldn't check the amount of memory on your Nvidia chip.
Would you like to know more? (Y/n) y
That does not mean, you won't be able to use Compiz.
If everything else went OK you are most probably fine.
In case you want the script to check this step as well, install the program
nvidia-settings on your system.