NOTE: Before installing xrdp add any secondary language you need to your system
by using, NOT an RDP connection, but a direct access to it, i.e. through a console of the virtualization system if it’s a VM
Switching languages does not work properly, at least when connecting from a MS Windows 10 system to Ubuntu through xrdp.
If you use the X button, upper right corner, to close the Windows RDP window, then the next time you connect to Ubuntu switching languages stops working.
The work-around I found is to NOT close the RDP window, but to log-out from Ubuntu, which closes the RPD window too by the way.
- Ubuntu 20.04 with GNOME 3.36.8