Ubuntu 18.04 with nvidia driver not working (anymore) on N76 laptop

I cannot get the nvidia driver up and running on my N76V laptop with Ubuntu 18.04 installed. It did work previously when but after I tried to install some newer drivers to get a Steam game running, I got lost somewhere in the chaos… :-/

See the output of the nvidia bug report.
nvidia-bug-report.log.gz (119 KB)

You’re having a mix-up of two driver versions:

[   75.590007] NVRM: API mismatch: the client has the version 430.50, but
               NVRM: this kernel module has the version 390.129.  Please
               NVRM: make sure that this kernel module and all NVIDIA driver
               NVRM: components have the same version.

Please run any .run driver installer with the --uninstall option, purge anything nvidia
sudo apt remove --purge nvidia*
running in an empty directory, then reinstall the driver from repo
sudo apt install nvidia-driver-440 nvidia-prime

Thank you so much, Generix! Your solution worked and I am able to use the Nvidia settings again. It is a pleasure to listen so someone who knows his craft!