Cant remember if I had to start TigerVNC manual or not, this the only doc I have saved on using it:-
https://www.hiroom2.com/2016/07/08/l...with-vnc-xrdp/
Your sys seems might be a bit more complex than mine was.
EDIT: How do I start VNC Server on boot? [have not read it]
https://askubuntu.com/questions/1209...server-on-boot
EDIT: Earlier today after Doom9 server was down (back online about 11:00AM-12:00AM BST),
I was first on-site, spent about 5-10 minutes all alone, was well spooky.