vnc security failure connecting to vncserver. desktop encryption setting

This seems to fix a problem connecting to Ubuntu.  Encryption is set to a level from other systems to work with vnc viewer, so can be disabled.  Might not be useful if not on a secure channel.  But tested and works.  This goes to the desktop software on the Ubuntu server machine.  

https://askubuntu.com/questions/1126714/vnc-viewer-unable-to-connect-encryption-issue

gsettings set org.gnome.Vino require-encryption false

Error message (or such)

Unable to connect to VNC Server using your chosen security setting.

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