[Trisquel-users] Re : Using old iMac as display for newer macbook?

[lcerf]

Vinagre is a VNC client (among other things).  The remote computer needs a  
VNC *server*.  Again GNOME's VNC server (Vino) is installed by default on the  
MATE edition of Trisquel 8.  There must be something in the "Control Center"  
to enable it, or you can execute "the 'vino-preferences' command (for  
instance from the command prompt you get with Alt+F2).