Why gnome-terminal menu bar is missing?

[compdoc]

>I use the command vncserver to start vnc on the server side and use
>vncviewer...


You don't have it set up properly. You need to modify xstartup as mentioned
in several tutorials on the web. This is one at random as found on google:

http://theseekersquill.wordpress.com/2010/03/16/vnc-server-ubuntu-windows/

You must also set the flag to make /etc/X11/xinit/xinitrc executable.