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I had a wired network connection that worked fine in Ubuntu 11.10.

I upgraded to 12.04 and immediately after the upgrade was completed, the OS reported my cable unplugged.

It was not unplugged and was not defective.

I have a D-link DFE-530TXS 10/100 ethernet NIC and I see what seems to be the generic 10050 driver loaded.

Is there any way to just flush anything and everything to do with the network configuration and have Ubuntu reset/find everything again?

If not, is there any way, I can get it to realize that my network cable is not unplugged? (considering it worked mere minutes before).

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I assume you formerly used a different driver. Does the additional drivers program offer a familiar driver? Logs to check include /var/log/syslog and the udev log under the /var/log/ tree as well. –  John S Gruber Jun 28 '12 at 4:17
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2 Answers 2

I had this problem on the latest 12.04 upgrade (I was already on 12.04, but an innocent-looking system update killed it).

Do you have settings for your interface in /etc/network/interfaces ? I have. This link may help: http://wiki.debian.org/NetworkManager#Wired_Networks_are_Unmanaged

In the end I un-installed Network Manager and it allows the standard /etc/network/interfaces stuff to work properly.

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Sounds crazy, but:

  1. How are the LEDs on the physical connection? Nearly all have leds, and if no LEDs are present typically the cord/instantiating end are at fault.

  2. If LEDs are present- are they "solid" or blinking?

  3. If Solid? Probably a driver or hardware issue. Replace the hardware and troubleshoot. (frys electronics has a 15-day return policy. Just saying.)

  4. If Blinking? Must be driver/configuration related. Post a relevantly censored printout of the command:

    ifconfig -a

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