Ubuntu – Keyboard layout wont change

I am using DVORAK layout and I want to switch to QWERTY but apparently this is not possible via GUI settings and it stuck on DVORAK
Is there any way to completely reset keyboard layout?
I am using ubuntu 12 04 and I have this problem in both KDE and GNOME
thanks

EDIT: the indicator on the top bar in GNOME is also messed up. I have another layout (persian (fa) ), but, when I switch between layouts with keyboard shortcuts, it is English(DVORAK) when the indicator is fa (and is not en), and vice versa.