Another way to solve this bug:
sudo apt-get update
sudo apt-get install build-essential linux-headers-$(uname -r)
cd ~
mkdir ~/rt61
cd ~/rt61
wget http://rt2x00.serialmonkey.com/rt61-cvs-daily.tar.gz
tar -zxvf rt61-cvs-daily.tar.gz
cd rt61-cvs*/Module
make
sudo ifconfig wlan0 down
sudo modprobe -r rt61pci
echo 'blacklist rt61pci' | sudo tee -a /etc/modprobe.d/blacklist
sudo make install
echo 'rt61' | sudo tee -a /etc/modules
And Edit the right parameters for your connexion
sudo gedit /etc/network/interfaces
--
[gutsy] rt61 wireless stops working after several minutes
https://bugs.launchpad.net/bugs/139832
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