My Internet connection is not working since I restarted my laptop (which is very old). Here's what I've tried:

  1. Ran sudo -s then tried /etc/init.d/networking stop:

    * Deconfiguring network interfaces...
    Root@carlos-laptop: ~#
  2. Ran status networking:

    Networking stop/waiting
  3. Ran status network-manager:

    network-manager start/running, process 621 
  4. Running restart networking gives me: restart: unknown instance:

  5. I successfully restarted network-manager.

  6. Ran /etc/init.d/networking start.

    It says I should instead use the service(8) utility and "since the script you are attempting to invoke has been converted to an upstart job, you may also use the service(8)... ...networking stop/waiting".

  7. Tried ifup eth0 and got ignoring unknown interface eth0=eth0

    ifdown eth0 gave: interface eth0 not configured

  8. Then I configured /etc/network/interfaces in nano.

    Specifically, I deleted loopback lo and inserted eth0.

    Then I ran /etc/init.d/networking restart. (By this point i thought it would work, but i was wrong.) I got:

    *reconfiguring network interfaces...
    Internet Systems Consortium DHCP Client V3.1.3
    Copyright...bla all rights reserved
    Listening on LPF/eth0/00:90:f5:4d:f8:ed
    Sending on --as above--
    Sending on Socket/fallback
    DHCPDISCOVER on eth0 to port 67 interval 4;6;7;14;19;11
    No DHCPOFFERS recevied.
    No working leases in persistent database - sleeping. 
  9. I tried to ping www.google.com and got ping: unknown host www.google.com.

  10. Ran dpkg --configure -a which gave:

    Setting up libsdl-ttf2.0-0 (--configure): subprocess installed post-installation script returned error exit status 2
    Errors were encountered while processing: 
  11. Tried restart networking again:

    There is already a pid file /var/run/dgclient.eth0.pid with pid 1811 killed old client process, removed PID file

    Internet Systems ...
    Got the same answer- no DHCPOFFERS received.

  12. Started Firefox, went to Google:

    -XML Parsing Error: not well-formed
    Location: jar:file///usr/lib/firefox/omni.ja!/chrome/toolkit/content/global/etError.xhtml
    Line number 23, Column 51:
    <link rel="stylesheet" href="chrome://global/s
  13. Tried to restart the laptop, and got nothing again.

  14. Ran route -n:

    Flags metric ref U     0      0
    Use Iface 0 eth0
  15. Did sudo dhclient eth0, got: no DHCPOFFERS received

  16. Restarted again, opened /etc/network/interfaces. It was empty. NetworkingManager.conf is also empty.

I don't know what to do. I am so frustrated right now and have been writing this for an hour on my friend's iPhone. So if you can, help me, thank you.

  • Welcome to Ask Ubuntu! We need more hardware information to help you. Please look at this question and then edit your question adding the information. – Eliah Kagan Sep 4 '14 at 23:09

Paste this into /etc/network/interfaces and reboot the computer:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp
  • No need to restart though, you can run sudo ifdown eth0 && sudo ifup eth0 after making the edits. That's for ubuntu 14.04, in prior versions you can run sudo service networking restart. – Esteban Sep 3 '15 at 17:28

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