rustdesk

To install the -gradually-more-Wayland-friendly- nightly version:
1. Grab it from here.

NOTE: if you're doing this on a remote session over rustdesk, SSH into that box first😉

2. Remove the old version and install the dependency

sudo dpkg -r rustdesk
sudo apt install libxdo3

3. install the new version e.g. for today's nightly:

sudo dpkg -i rustdesk-1.4.5-x86_64.deb
or:
sudo apt install -fy ./rustdesk-1.4.5-x86-64.deb

It should look something like this:
Selecting previously unselected package rustdesk.
(Reading database ... 305573 files and directories currently installed.)
Preparing to unpack rustdesk-1.4.5-x86_64.deb ...
Failed to stop rustdesk.service: Unit rustdesk.service not loaded.
Unpacking rustdesk (1.4.5) ...
Setting up rustdesk (1.4.5) ...
Created symlink '/etc/systemd/system/multi-user.target.wants/rustdesk.service' → '/usr/lib/systemd/sy
stem/rustdesk.service'.
Processing triggers for desktop-file-utils (0.28-1) ...
Processing triggers for hicolor-icon-theme (0.18-2) ...

4. Launch:

5. If you haven't already, allow rustdesk clients through the firewall:

sudo ufw allow 21114:21118/tcp
sudo ufw allow 21116/udp

sudo ufw enable

6. 
On lowly hardware we need H265:

sudo apt install kubuntu-restricted-extras
sudo apt install intel-media-va-driver-non-free libva-drm2 libva-x11-2
sudo usermod -aG video,render $USER

7. Configure (I think for both client and server...?):

7. Check that the rendering is handed over to the gpu:
sudo apt install intel-gpu-tools
sudo intel_gpu_top

(e.g. move a window around and look at the rendering plot)

8. Unlike me, don't forget to actually (RE-) start the service on the box you want to control😉