I've set up multiple user accounts in Xubuntu 14.04. I (the admin) am a dvorak user so I have English US dvorak as the default layout, but the other user is a qwerty user. I've added English US standard as an optional layout from within my account, and as the only layout from within the other user's account. However, dvorak seems to be the only layout ever available at the login or lock screen page (no matter who's account is selected, who was last logged in, etc). There's a drop-down menu that lists English US, English UK, English Canada, etc, at the login screen, but they all seem to be set to dvorak. How do I add an option to switch between the two layouts at the login screen?