Note: I installed RealVNC for a local remote control in place of Teamviwer that I can not use anymore, but I saw by looking in the menus of the new version of ubuntu that other software have been added, notably SSHVNC (i don't know if this software is user friendly).
There is no any "SSHVNC" there, there is Sharing in the settings, which is disabled by default, and I have a big request to devs, guys please can you make it activated, with disabled "require-encryption" and the default password (miner1 for example) in the next image of nvOC? Cause it's not simple to do that on each rig by SSH, if you do not have a possibility to attach a monitor to it.