Ubuntu 12.04 网络链接 不工作

装完Ubuntu 12.04 之后， 发现自己得机子网络连接有问题， 无法上网。

搜索发现这个问题很常见：

http://askubuntu.com/questions/46942/how-do-i-stop-my-ethernet-network-connection-from-dropping

该文提供了一个解决方案， 那就是再装一下驱动, 你一定要看清硬件配置啊。

此处复制粘贴一下原文：

Wake-on-lan after shutdown - this didn't work

BUT!!! i know how to fix it!!! it's not provider's fault it's broken r8169 driver!!!

here's the instruction:

Download the official realtek driver

http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=5&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false#RTL8111B/RTL8168B/RTL8111/RTL8168%3Cbr%3ERTL8111C/RTL8111CP/RTL8111D%28L%29%3Cbr%3ERTL8168C/RTL8111DP

then remove the r8169 module from the linux kernel.

# rmmod r8169


<Quick install with proper kernel settings>
Unpack the tarball :
# tar vjxf r8168-8.aaa.bb.tar.bz2
Change to the directory:
# cd r8168-8.aaa.bb
If you are running the target kernel, then you should be able to do :
# ./autorun.sh (as root or with sudo)
You can check whether the driver is loaded by using following commands.
# lsmod | grep r8168
# ifconfig -a
If there is a device name, ethX, shown on the monitor, the linux
driver is loaded. Then, you can use the following command to activate
the ethX.
# ifconfig ethX up

Finally, blacklist the r8169 driver add the following to /etc/modprobe.d/blacklist.conf:

#blacklist r8169 driver
blacklist r8169

i found it here

http://www.rvdavid.net/how-to-get-gigabit-speeds-from-rtl81118168b-pci-express-gigabit-ethernet-controller-on-ubuntu-linux/

and it works!!! now it's all good with net speed