rtl8192cu Failed to request firmware

rtl8192cu:rtl92cu_init_sw_vars():<0 -0="-0"> Failed to request firmware!

$ wget ftp://WebUser:Lc9FuH5r@209.222.7.36/cn/wlan/RTL819xC_USB_linux_v3.4.4_4749.20120806.zip
$ unzip RTL819xC_USB_linux_v3.4.4_4749.20120806.zip
$ cd RTL8188C_8192C_USB_linux_v3.4.4_4749.20120806/
$ chmod u+x install.sh
$ ./install.sh

Reference :
[SOLVED] trying to install Netgear usb wireless adapter - Page 4 - Ubuntu Forums
Realtek