I'm new Ubuntu user. I just installed Ubuntu 15.10, my problem is like this: I can connect to Internet through wifi without any problem, but when I turn off the wifi, I can't connect through wired connection. I searched a lot but couldn't find how to fix the problem.


Thank you for your help, but I still have problem. Here is the output from the ifconfig command:

$ ifconfig
enp5s0: Link  encap:Ethernet   HWaddr  28:d2:44:84:98:ed
        UP  BROADCAST  MULTICAST   MTU:1500     Metric:1
        RX  packets:0 errors:0 dropped:0 overruns:0 frame:0
        TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:1000
        RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo: Link encap:Local Loopback
        inet addr:  Mask:
        inet6 addr: ::1/128 Scope:Host
        UP LOOPBACK RUNNING  MTU:65536  Metric:1
        RX packets:300 errors:0 dropped:0 overruns:0 frame:0
        TX packets:300 errors:0 dropped:0 overruns:0 carrier:0
        collisions:0 txqueuelen:0
        RX bytes:25921 (25.9 KB)  TX bytes:25921 (25.9 KB)

First things first, does the wired ethernet connection you are trying to use work with another computer?

If not, try switching the cable or port that it is connected to - e.g moving from a switch to the ports on the back of your router.

If you are sure that the wired connection does work, then there are a few things you could try:

  • Firstly, open a new terminal and enter the command below, making sure that your ethernet cable is attached and wifi turned off


    The output of this should show you all of the connected/active network adapters. one nearest the top should be named either 'eth0' or 'enp2s0' so similar. This should display an 'inet addr:192.168.0.#'. If you do not see this please edit your question with a copy of the output from the 'ifconfig' command.

  • Secondly, enter the command below, into a new terminal:

    sudo ifconfig eth0 up

    With 'eth0' being edited depending on the output of 'ifconfig'

    This should start the ethernet (wired connection) adapter and provide you with network connection.

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