X2GO client not forwarding keys like Ctrl and Alt

Solution 1:

I know this is old, but there was no answer... I found this, which worked for me (and others)

@glyndonwrote: For me (Ubuntu 17.10), the fix was to turn off the "show mouse pointer location when Ctrl key pressed."

I had to use dconf-editor to locate that setting, as Ubuntu no longer includes it on the regular settings dialog panel.

(in dconf-editor: org/gnome/settings-daemon/peripherals/mouse)