Ubuntu

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First of all, ensure you have the necessary prerequisites:

sudo apt-get install linux-headers-generic build-essential dkms git
Clone the updated driver with git:

git clone https://github.com/pvaret/rtl8192cu-fixes.git
Set it up as a DKMS module:

sudo dkms add ./rtl8192cu-fixes
Build and install the driver, you may need check the version here (e.g. 1.9 may change):

sudo dkms install 8192cu/1.9
Refresh the module list:

sudo depmod -a
Ensure the native (and broken) kernel driver is blacklisted:

sudo cp ./rtl8192cu-fixes/blacklist-native-rtl8192.conf /etc/modprobe.d/
Let's not take any chances. Instruct Ubuntu to load the new driver when it starts up.

echo 8192cu | sudo tee -a /etc/modules
Reboot.

You're done.