Y470 + ubuntu10.04 fail to access the Internet due to Netlink bcm57781

Note: I installed ubuntu10.04 and win7 dual systems, and the computer Lenovo y470.
After ubuntu10.04 is installed, update is prepared, but the network cannot be connected. Start searching for problems:
Ifconfig
If eth0.0. is not displayed, it indicates that no network card is available.
The driver was not found for a long time. I had to go to Broadcom official website http://www.broadcom.com/support/ethernet_nic/netxtreme.php.) download driver
Download To get a file like this: linux-3.122g.zip
1. decompress the package and obtain a Server File. Enter the/Server/Linux/driver folder.
CD/Server/Linux/driver
2. Tar-xvzf tg3-3.122g.tar.gz
3. CD tg3-3.122g
4. Make
5. sudo insmod tg3.ko (kernel 2.6.x. For other versions, see readme. txt)
6. sudo make install
This installation is successful.

Thank you for your enthusiastic help!