I'm having the same issue. ifup and ifdown also do not see the interface either. ifconfig eth0 up|down both do work (this hits the kernel directly so it's not surprising).
I'm a newbie to debian and just converting from RH/Fedora but I noticed the /etc/network/interface file does not contain a reference to eth0, only the loopback. All reference on the web point to this as the place to configure interfaces. Apparently this text file is not used any more. If I add anything to to the text file (including iface eth0 inet dhcp which should configure it for dhcp), the interface no longer works and the GUI disables the "Configure" button. I'm a bit upset that they changed something as basic as how networking configuration is persisted. This only has the purpose of selling support and training. It provides no value (in fact a great disservice) to the end user community. Now everything on the web regarding how to setup network is invalid. To boot the GUI tools don't actually work increasing the likely hood of folks purchasing support. This is the same kind of scam Fedora/RH are engaged in and why I thought I would look for a new distro after 10+ years of loyalty. (That and the fact upgrades have become a major pain.) Maybe Ubuntu is not right disro either. -- network-admin error: The interface does not exist https://bugs.launchpad.net/bugs/184711 You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is a bug assignee. -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
