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If Exxact originally provided the NVIDIA driver installation, it can be found in either the '/root' or , '/home', or 'CUDA_INSTALL*" directory.

# login/change to root permissions
su
init 3
./NVIDIA* [tab to fill in the rest]
# accept terms, and answer 'no' to everything else

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If you need to remove prior NVIDIA installation

Please be careful what you remove. This may also remove CUDA or prevent you from re-installing NVIDIA driversYou would need to first locate what NVIDIA drivers are installed. Here's a link to help you locate which NVIDIA driver version you have installed.

https://linuxconfig.org/how-to-check-nvidia-driver-version-on-your-linux-system

If you have the original .run' file, you can also just uninstall it using the command below.

sudo yum purge nvidia-*./NVIDIA-Linux-x86_64-xxx.xx.run --uninstall

Additionally, the links below elaborate on removing proprietary NVIDIA driver in Ubuntu:

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