Written on December 2, 2011 at 4:21 pm by

Ubuntu- Unmanaged Interface after PXE Installation

Filed under Ubuntu {2 comments}




If you are using PXE to liveboot Ubuntu OS for rescue or for other purpose than installation, you’ll never face this issue as Ubuntu works great over PXE.
But if you Install Ubuntu using PXE, you may not get network connectivity on freshly installed Ubuntu OS.

In network settings, you’ll find Wired Unmanaged

To resolve this, all you need is to remove all other interface except lo from /etc/network/interfaces
sudo cat /etc/network/interfaces #working config
auto lo
iface lo inet loopback

sudo cat /etc/network/interfaces #previous non-working config
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual

Once you are done with necessary changes, restart netwok-manager
sudo service network-manager restart


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  • E.

    Hey man. I’m having the same problem on my computer right now with the “unmanaged connection.” I’ve been following all your commands but can’t get “auto lo” and “iface lo inet loopback” to change. What commands do I use to do that?

    • dpthakar

      this is applicable only for pxe installation. whats entry in your /etc/network/interfaces?

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