set up VNC on Ubuntu server Wii U:
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I can connect to Wii U Linux virtually rather then have a TV or monitor for it.
I will need Ubuntu server 16.04 installed on Wii U USB drive (no other thing plugged into the USB ports other then the Wii LAN adapter or else Linux wont boot).
As well as the Tiramisu CFW on Wii U and the game pad (need to press and bold the "B" button on boot to select the Linux forwarder.
You will also need ssh server all ready installed on Ubuntu in order to install/set-up things remotely.

*This process also works on PS3 ubuntu 16.04.

1. You will need to have a display manager installed, a desktop environment, and the VNC server:
sudo apt install xorg xdm wmaker tightvncserver

You will need to reboot the Wii U for it to work.

2. Upon reboot, you can start the VNC server through ssh with this command:
vncserver
Then kill it with:
vncserver -kill :1

Then edit the file with config file with this command:
sudo nano ~/.vnc/xstartup

Add this near the start of the file:
xrdb $HOME/.Xresources
lxsession -s Lubuntu -e LXDE

save and close.

3. Restart with "vncserver" upon every reboot,



4. Then through krdc on Linux, go to this address to connect to VNC:
emperor_penguin_of_japan@192.168.0.6:5901

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Source: https://bitlaunch.io/blog/how-to-install-and-configure-vnc-viewer-on-ubuntu-20-04/
Date: February 23rd 2022
Update: March 11th 2022 (adds more steps for functioning sytem and notes PS3 support).