Ubuntu “Wired Network – device not managed” 问题

 声明：本文章转载自http://blog.youkuaiyun.com/half_human55/article/details/5713033，谢谢本文作者的辛勤劳动。

问题：Ubuntu升级后，在NetworkManager里发现只能用无线网连接，有线eth0的位置显示“Device not managed”

应该是NetworlManager没有管理有线连接。

google到解决方法，具体原理不是很清楚，只是按提示做了，可以解决问题，存档以备以后查看

 

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Ubuntu 9.04 “Wired Network – device not managed”

by Craig Mayhew on Jun.13, 2009, under Guides/Fixes, Linux/Ubuntu

After upgrading to Ubuntu 9.04 I’ve found the network manager GUI to be far superior to the previous version I was using in Ubuntu 8.04 LTS. Unfortunately when I was using Ubuntu 8.04 I made some custom alterations to my network setup in the “/etc/network/interfaces” file. The Network Manager in 9.04 wasn’t keen on this and so refused to manage it, instead it displayed the message “Wired Network – device not managed”.

As a work around I commented out all of my changes by placing a # at the beginning of each line in my interfaces file:

Open the interfaces file in an editor:

sudo vim /etc/network/interfaces

This is an example of how my file looked before I modified it. Yours will be different:

 

auto lo
iface lo inet loopback
iface eth2 inet static
address 192.168.0.44
netmask 255.255.255.0
gateway 192.168.0.1
auto eth2

 

And here’s the same file again, but I’ve added #’s at the beginning of each line so that they are ignored:

#auto lo
#iface lo inet loopback
#iface eth2 inet static
#address 192.168.0.44
#netmask 255.255.255.0
#gateway 192.168.0.1
#auto eth2

In order for the changes to take effect, 

we need to restart the network manager and the applet by running each of these in the command line:

sudo /etc/init.d/networking restar

And now restart the network manager applet:

 

pkill nm-applet
nm-applet

You should now be able to manage the network connection from within the network manager applet.

 

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注:

1.要让NM管理有线连接，还需要编辑文件 /etc/NetworkManager/nm-system-settings.conf  把

      [ifupdown]
      managed=false

      选项设置为true

2.kill nm-applet从新启动后，并没有起作用。后来是kill了NetworkManager进程后，修改生效。