connecting to wifi internet using TP-Link (TL-WN723N) usb adapter with Ubuntu 12.10

Download RTL8188CUS for Linux from Realtek.com

Extract the downloaded archive by right clicking, then selecting Extract Here.

Blacklist the original mudule:

echo 'blacklist rtl8192cu' | sudo tee -a /etc/modprobe.d/blacklist.conf

... then reboot.

Build the new module:

cd RTL8188C_8192C_USB_linux_v3.4.4_4749.20121105
sudo bash ./install.sh

It will take a minute to complete, and should start working right away.

PS: Keep the downloaded files, because you'll need to redo the last step after every kernel update.