If there already is a Nvidia proprietary graphics driver installed in Ubuntu you will need to uninstall it before installing a replacement Nvidia proprietary graphics driver. Furthermore it is not necessary to uninstall any of the built-in graphics drivers because if a proprietary graphics driver is installed, Ubuntu will select it and use it automatically with the built-in graphics drivers remaining installed for possible use if Ubuntu has a problem running the proprietary graphics driver(s). If your computer has an Intel processor and it doesn't have a discrete graphics processor, the command ubuntu-drivers devices will not return results that show that a proprietary graphics card driver is available to be installed because the Intel graphics driver is built-in in Ubuntu. The devices command of ubuntu-drivers lists proprietary drivers that are compatible with your computer's GPU.

For most users there's no reason to guess about which proprietary graphics driver to install, because if your system deserves a graphics driver upgrade it will get one. Sometimes sudo apt upgrade even upgrades the proprietary graphics driver packages to more recent packages, in which case sudo apt autoremove removes the older packages which were replaced by the newer ones. In Ubuntu 20.04 and later running sudo apt upgrade not only upgrades the versions of the proprietary graphics drivers that were installed by sudo ubuntu-drivers autoinstall. The autoinstall command of ubuntu-drivers installs drivers that are appropriate for automatic installation including their dependencies. Open the terminal and type: sudo ubuntu-drivers autoinstall Ubuntu has a built-in ubuntu-drivers program that can decide automatically which proprietary graphics driver to install, and streamlines the installation of Nvidia drivers.

The Linux kernel contains a set of well-maintained open source drivers for almost everything 1, but it does not contain proprietary drivers which are closed source.

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