This
[mcu]
serial: /dev/serial/by-id usb-1a86_USB_Serial-if00-port0
cannot be correct.
Refer to Installing Klipper with KIAUH and in particular chapter 5
potentially I could be
serial: /dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0
Note that Desktop versions introduce additional points of failure. So be sure to check OS Sanity Checks and Fixes