Which macOS VNC client can connect to the default Ubuntu VNC server? A few machines running Ubuntu 18.04 have to be accessed remotely through VNC.

On Ubuntu, I can use Remmina Remote Desktop Client to connect to the VNC server. The VNC server on Ubuntu is setup via the default Desktop Sharing:



I want to connect to that Ubuntu session via VNC from a macOS client.

I tried using the "hidden" default VNC client by going through Finder and using ⌘+k, and:

vnc://ubuntu-server-hostname.local


and: 

vnc://ubuntu-server-hostname.local:5900


and 

vnc://{UBUNTU-SERVER-IP}:5900


yet it states that version of the server cannot be identified. I am assuming the the default client works only for macOS servers.

Is there, and if so which, a VNC server can connect to an Linux server? I prefer the solution to be open source or freeware. A paid solution is not an option for me, yet feel free to name it to give a working solution.
There exist many modern VNC clients for macOS that supports connecting to Linux servers. Free ones include TigerVNC and RealVNC Viewer.