Qt: XKEYBOARD extension not present on the X server.

check details in
https://github.com/spyder-ide/spyder/issues/3713


From replies

athlonshi commented on 4 Jul 2017

For those using Exceed X Server, you may also need to change Xconfig setting. Go to Xconfig --> Settings --> Protocol... --> Extensions --> check XKEYBOARD and save the settings.

Oreki47 commented on 6 Oct 2017

I'm using TightVNC with Ubuntu 14.04.
It works on my machine with:
export XKB_DEFAULT_RULES=base
export QT_XKB_CONFIG_ROOT=/usr/share/X11/xkb
The set rules has to come first.