You aren't following the instructions in my post. You don't run sgfxi from a terminal with sudo, that way you are starting it from a graphical window you MUST start it from a non graphical virtual terminal. Read my instructions again and with the exception of the installing bit (which you have already done) follow them precisely, they are not hard to follow, you are just doing it wrong that is why you are having trouble.
One thing to be aware of though, if you have hybrid graphics sgfxi probably wont work anyway.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).