Possible Duplicate:
Can auto-hide for the application menu be turned off in Unity?
Why is the application menu appears only on "mouse on"? How to disable autohide option for all programs?
Possible Duplicate:
Can auto-hide for the application menu be turned off in Unity?
Why is the application menu appears only on "mouse on"? How to disable autohide option for all programs?
You can set the environment variable UBUNTU_MENUPROXY=0 before you log in. If you only want to deactivate it or enable it for a single application, then you can do things like
UBUNTU_MENUPROXY=0 gcalctool
. Use 1 instead of 0 to enable.