Ubuntu 12.04 wireless connection, but cannot solve the problem

Ubuntu 12.04 is connected wirelessly, but cannot access the Internet. In Windows 7, use wubi to install Ubuntu 12.04 for dual systems. After www.2cto.com is installed, Ubuntu automatically recognizes my wireless network card and connects to the wireless network manually. However, you cannot access the Internet or even access the vro. The IP address of the wireless network adapter can be automatically obtained. The Gateway and DNS are correct, but the IP address cannot be obtained through the router. Cause: Although my wireless network adapter supports 802.11n (150 M/s) and Ubuntu 12.04 automatically uses 802.11n to connect to the router, in fact, the NIC Driver Installed in 12.04 does not support the 802.11n protocol! Even if it is updated to the latest patch, it is not supported! Www.2cto.com solution: restrict the multi-protocol support (802.11b/g/n) of the router to only 802.11b/g (up to 54 M ),
Ubuntu can be accessed normally after wireless connection is reconnected ~~!!

Source http://blog.sina.com.cn/s/blog_6452c6b4010147nn.html