when i press back space key on my laptop right click mouse option window is displaying

[rama prasad]

Hi could you please suggest me how to rectify the problem, am using ubuntu 14.04 LTS when i press back space key on my laptop, the window is displaying on the screen(right click option of the mouse which supposed to be appear when i click right click of mouse).

 

[i7Baby]

You've somehow rejigged your keyboard. Undo whatever you did.