Resolve slow connexion when using wifi in ubuntu 11.04, 11.10 and LinuxMint 11

After installing or upgrading to Ubuntu 11.04 or 11.10 Oneiric Ocelot  you noticed that the connexion is too slow when using the wifi, this is a simple solution. This solution works also for LinuxMint.

1- First method : You need to disactivate IPv6, to do that, open terminal and enter the following commands:

echo "#disable ipv6" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.all.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.default.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf
echo "net.ipv6.conf.lo.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf

Then restart your system.

If you still have the issue, follow also instructions on step 2.

2- Second method :  A second solution for this issue can be by using the following :

Open terminal and enter the following command:

sudo -s
gksu gedit /etc/modprobe.d/ath9k.conf

at the end of the file add this:

options ath9k nohwcrypt=1

Save an restart your OS.