I just upgraded my test and development VM to 15.10, and I lost my network device eth0.

ifconfig just reports the loopback device adapter, yet lspci reports the Intel network controller is there.

  • Close voters: both the question and the answer may be useful for future visitors. I do not see any reason for closing. – Andrea Corbellini Sep 8 '15 at 12:29
  • Please could someone clarify why this question is off topic? 15.10 is upon us. – David Sep 13 '15 at 10:24
  • ... especially since the released version (which then is not a "development version" anymore) exposes the same problem. Took me hours to learn at least some basics about udev a.s.o. Not nice. – JeffRSon Oct 23 '15 at 20:18

The network adapter was renamed from eth0 to enp0s3.

I found this out by using dmesg | grep eth0.

I then updated the file /etc/network/interfaces by changing eth0 to enp0s3.

  • 1
    enp0s3 is the name of an Ethernet device as given by the new version of udev, which enables stateless persistant network interface names. The strange thing is that it shouldn't have happened during upgrade, only on fresh installation. Can you please provide more details about the upgrade? – Andrea Corbellini Sep 8 '15 at 12:44
  • Ubuntu server, not network-manager – David Sep 8 '15 at 14:16

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