eth0 disappeared after hardy upgrade

**raistlin_kell** · April 28th, 2008

I've just completed a successful(?) upgrade from Gutsy 7.10 to Hardy 8.04 on 2 of my desktops but 1 has lost its ethernet connection.

The ethernet adapter is on an Asus CUSI-M mobo. I've disabled in the BIOS and re-enabled which had no effect. I installed a D-Link DFE530TX PCI NIC & an Intel Dual E100 PCI NIC. Any & all ethernet adapters i insert are not being recognized in the knetworkmanager. They will not enable in the System Settings.

the onboard ethernet adapter was working fine prior to the upgrade. If i open the knetworkmanager and enable any of the eth? shown in the list, the following error appears onscreen:
"could not parse XML output from the network config backend"

Is there a way to reset the network config backend?

If i do a lcpci, all the ethernet adapter appear in the output. All Ifconfig's are only reporting "lo" adapter in the list.

**richcoosa19** · April 28th, 2008

Can you try and give us the output of your /etc/network/interfaces?

**pro003** · April 28th, 2008

just type in your terminal:

Code:

ifconfig eth0 up

Code:

ifconfig

**richcoosa19** · April 28th, 2008

Originally Posted by raistlin_kell

Is there a way to reset the network config backend?

If this is the package it is referring to, you can try to run

Code:

sudo apt-get install --reinstall network-config

More than likely it is referring to knetworkconf since you are running kubuntu in that case:

Code:

sudo apt-get install --reinstall knetworkconf

**richcoosa19** · April 28th, 2008

Originally Posted by pro003

just type in your terminal:

Code:

ifconfig eth0 up

Code:

ifconfig

The problem with this is that when they reboot they won't have networking again. Making sure this is in /etc/network/interfaces will fix that:

Code:

auto eth0
iface eth0 inet dhcp

If they can run ifconfig eth0 up and have networking, adding this to the config file should fix it.

But I am kinda worried about the error message involving the XML.

**raistlin_kell** · April 29th, 2008

Well i went back to basics.
1- Pulled the 2nd NIC
2- enabled the onboard NIC
3- edited /etc/interfaces/network so only the following was shown
auto eth0
iface eth0 inet dhcp
4- reboot

After the reboot, eth0 worked fine. knetworkconf still showed no valid ethernet adapter so i reinstalled that. Now knetworkconf doesn't want to start up at all which is fine with me.

I have a happy desktop again. thanks to everyone for the above input! kubuntu and the devout followers make this flavour of linux ROCK!