Checking link speed in Ubuntu

 First Update the system

$ sudo apt update & sudo apt upgrade
Install the network tools
$ sudo apt-get install ethtool net-tools
Method 1
$ ip addr
The other methods below require you to know the name of the interface. For example in the below cases it is enp0s3.

Method 2
$ sudo ethtool enp0s3
Method 3
$ sudo cat /sys/classes/net/enp0s3/speed

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