A couple of good vnc setup pages for Linux Ubuntu

For VNC remote desktop access via vnc server.  Most times now use xvnc and microsoft remote desktop client everywhere with windows desktop.

And remmina for remotes on ubuntu / linux desktops.  Remmina will access these desktops.  microsoft rdp will not.

https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-on-ubuntu-16-04

https://www.howtoforge.com/how-to-install-vnc-server-on-ubuntu-14.04