Slow wireless internet connection in ubuntu 11.10 [SOLVED]

Solution: This solution sounds to work for many people.. Give a try.. Open the terminal and run:
sudo gedit /etc/modprobe.d/iwlagn.conf
And change:
options iwlagn 11n_disable=1 11n_disable50=1
to:
options iwlagn 11n_disable=1
And then reboot.. If the above file does not exists just create one and enter the line above, and then reboot..
Many people got this problem fixed after upgrading the ubuntu 11.10