Install xtrace by entering the following commands in the terminal:
sudo apt update sudo apt install xtrace
Description:
trace communication between X client and server
What strace is for system calls, xtrace is for X11 connections: you hook it between one or more X11 clients and an X server and it prints the requests going from client to server and the replies, events and errors going the other way.
Homepage: http://xtrace.alioth.debian.org/
Version: 1.3.1-1build1
Section: universe/x11