Couldn't find the topmost menu bar in ubuntu mate

Couldn’t find the topmost menu bar in ubuntu mate. Because of this we couldn’t connect to any network. Can you please me in getting the menu panel

This sounds like a screen size problem.
Had a similar thing happen with a really low-res TV a while back.
Try and hit CTRL + ALT + T to open a terminal, then

mate-display-properties

Alternatively start MATE-Tweak

mate-tweak

And try the redmond panel layout