ubuntu screen sharing to mac

a) $ sudo apt-get vino

b) $ vino-preferences

c) setup accordingly on  vino-preference GUI (disable 'encyrption')

d) $ sudo apt-get install dconf-editor

e) $ dconf-editor

f) setup accordingly based on 'vino-preference' ('org' --> 'gnome' --> 'desktop' --> 'remote-access' --> unset 'require-encryption')