There is discussion about removing the 'sim.gscreen.silverdragon' simulation config in master as it fails on load with Gtk related errors on current debian bookworm installations as well as RIP installation of both 2.9.x and master.
So, if anybody has actually managed to run the 'sim.gscreen.silverdragon' simulation config in 2.9.x please drop a note. github.com/LinuxCNC/linuxcnc/issues/3094
Thanks