This Marlin is an optimized firmware for Ender 3v2 3D printers. | It is based upon original Marlin repository and has many improvements from the bugfix branch.
Check your BLtouch connections, this firmware uses the five pin bltouch connector as can be found in this guide https://github.com/mriscoc/Marlin_Ender3v2/wiki/3D-BLTouch also check if you install the correct bltouch firmware version.
UPDATE: After reading 600+ of your comments, here is the updated list of open source Linux programs mostly for beginners (thus mostly gui).
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SLP339 Jeremy Rubin – What is Check Template Verify?
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