Leightroom 11 and printer

[Costantino23079612ti8j]

Same photo, same printer, same profile already printed OK com Leightroom 6 now printed with Leightroom 11 appears dark.

[TheDigitalDog]

You should always test output using good color reference images designed for that task. The color reference images RGB values are such they are set for output and are editing and display agnostic. Test the output this way and examine for the same color issues so we know it's not your image specific issues causing the problems:

http://www.gballard.net/photoshop/pdi_download/
http://www.normankoren.com/makingfineprints1A.html#TestPrint
http://www.digitaldog.net/files/2014PrinterTestFileFlat.tif.zip

Consider starting from scratch with a new, virgin Print Template where you configure everything in Lightroom Classic and the Print Driver correctly, and never select a custom preset from the dropdown menu in the print driver if one is available.