How to calibrate the screen on a Thinkpad X230 within Linux

If you run Gnome or KDE Plasma as your desktop environment, there are built in tools for you to calibrate your screen. You just need to find an .icm or .icc profile file that matches your screen to calibrate it. (See below to find one that matches the X230 with the IPS screen.) I have run LXDE up to now...