i have installed Ubuntu 8.10 but when i install nvidia driver,only thing i can see is black screen....i tried all solutions,all versions of drivers,even restricted from manager,and nothing,every time black screen...i have Nvidia Msi geforce 8600GT,Ubuntu is x86...any solution for this???

Are you sure your Nvidia drivers were compiled to run against your kernel?

I. e. you cannot install Nvidia drivers that do not match your kernel version.

How did you install them? With a package manager? Bad karma...

I usually do it by downloading the Nvidia driver package I want, then manually installing it. During the install process it asks if it should attempt to compile itself against my current kernel, to which I reply yes and it works perfectly (I have an older 7950GT NVidia based card)

What often happens if you use a package manager to update your Nvidia drivers is that the drivers get installed and updated just fine, but they no longer match your particular kernel's version and settings, so they won't start no matter what you do and you get a black screen as a result, because X windows can no longer start up.

To remedy this you most likely need to compile your Nvidia drivers locally against your local, running kernel's configured source tree.

i have downloaded binary driver....latest,installed it,everything goes fine,it compiles,then i run nvidia-xconfig,it updates xorg.conf,reboot,and black or corrupted screen,i have tried with a package manager too,and again black or corrupted screen....everything i do can't help,it's always corrupted or black screen.

Have you checked your xserver's log to see if you can find any errors indicated there?

I assume you are 100% SURE your card is working? For the modes you intend to use?