Re: why does this happen in my perfect OS?
i ran and still run ubuntu since years and i'd not consider it perfect at all. anyway what card it is? and did you check the driver release notes (they list the supported cards)? for semplicity in ubuntu you might want to use the repository drivers in place of the installer from nvidia (also because it seems ubuntu screwed a lot of symlinks (they link to the mesa library) in the last release and the installer doesn't fix them manually), plus you'd have to reinstall the driver each time some types of updates are done.