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Installing the NVIDIA driver, CUDA and cuDNN on Linux (Ubuntu 20.04)

This is a companion piece to my instructions on building TensorFlow from source. In particular, the aim is to install the following pieces of software

NVIDIA graphics card driver (v450.57)
CUDA (v11.0.2)
cuDNN (v8.0.2.39)

on an Ubuntu Linux system, in particular Ubuntu 20.04.

	//Requires node.js and mqtt library installed.
	var mqtt = require('mqtt');

	const thingsboardHost = "demo.thingsboard.io";
	// Reads the access token from arguments
	const accessToken = process.argv[2];
	const minTemperature = 17.5, maxTemperature = 30, minHumidity = 12, maxHumidity = 90;

	// Initialization of temperature and humidity data with random values
	var data = {

	// Requires node.js and mqtt library installed.
	var mqtt = require('mqtt');
	var os = require("os");

	const thingsboardHost = "demo.thingsboard.io";
	// Reads the access token from arguments
	const accessToken = process.argv[2];

	// Default topics. See http://thingsboard.io/docs/reference/mqtt-api/ for more details.
	const attributesTopic = 'v1/devices/me/attributes';