This will be a short one since there isn’t many steps so lets begin by installing conky with the commands
sudo apt install conky
Install Lean Conky by simply downloading the zip and extracting it to wherever you like.
Now all we need to do is open the Lean Conky folder and run the start.sh
cd /path/to/lean-conky ./start.sh
Conky and lean conky will start up and you should now have an excellent HWMonitor alternative on Ubuntu.