When I try to add anything to the menu in 12.04, I get this error.

$ alacarte

Traceback (most recent call last):

  File "/usr/share/alacarte/Alacarte/MainWindow.py", line 317, in on_new_item_button_clicked

    process = subprocess.Popen(['gnome-desktop-item-edit', file_path], env=os.environ)

  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__

    errread, errwrite)

  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child

    raise child_exception

OSError: [Errno 2] No such file or directory