Fixed Lenovo P920 Nvidia driver installtion in Ubuntu 22.04

The recent Ubuntu 22.04 upgrade auto installation caused display problem in our GPU server, the Lenovo P920 workstation. After surveying, I found the best solution and solved the problem by a few command lines.

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sudo apt-get purge nvidia *
sudo apt-get update
sudo apt-get autoremove

After restart, the P920 comes back with the former pretty Ubuntu desktop display.