I recently installed Lubuntu 13.04 64-bit on one of my older computers (the computer is ancient - DDR1, no USB boot, yet it's 64-bit. Go figure.)

Anyway, the Wi-Fi adapter I tried to use malfunctioned very quickly, and, after a bit of troubleshooting, I gave up (for the time being.) I decided to try and get the built-in ethernet working. The Lubuntu box is wired via Ethernet to a computer running Windows XP, which is connected to Wi-Fi and is set to share it. Trouble is, Windows says the ethernet cable is unplugged, and the computer running Lubuntu is entirely oblivious to the existence of its Ethernet port. lspci | grep -i eth returns absolutely nothing, so I can't even put the correct firmware on a USB stick and install it that way.

What's wrong? I will provide any computer/OS/BIOS/etc details requested.

UPDATE: Found out why Lubuntu wasn't recognizing the Ethernet - the BIOS had Onboard LAN disabled. I enabled it, but now the tray icon says "Ethernet - device not managed", and sudo ifup eth0 starts spamming a bunch of stuff about DHCP, and the command never finishes.

  • Post the output of lspci -nn and lshw -C network – grimpitch May 23 '13 at 21:02
  • @grimpitch pastebin.com/ZmP8MGNG – JamesTheAwesomeDude May 23 '13 at 21:16
  • Is it unplugged? It says the link is down. Try another driver: sudo rmmod 8139too && sudo modprobe 8139cp – grimpitch May 23 '13 at 21:49
  • @grimpitch rmod was an invalid command, but sudo modprobe -r 8139too seemed to work. Adding the module 8139cp didn't fix it, though - the network tray icon now says "no network devices available", and running ifdown and ifup doesn't work - ifup says "could not configure hardware" or something like that. – JamesTheAwesomeDude May 23 '13 at 22:00
  • It's not the the right driver for the adapter then. First run mii-tool eth0 -F 10baseT-FD then remove 8139cp and reload 8139too. – grimpitch May 23 '13 at 22:16

Look into /etc/NetworkManager/NetworkManager.conf and change the line managed=false to managed=true then restart network-manager:

sudo service network-manager restart

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