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[ubuntu] nm-connection-editor eth0 not managed

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http://ubuntuforums.org – Hi, I'm getting rather fed up with this Network Manager applet on Ubuntu and its seemingly erratic behaviour. I often use my laptop for things like dhcp server to do pxe boot on other machines for netboot installs and other stuff. Often I have to set static address on eth0 etc. I know how to set a static address for eth0 by editing /etc/network/interfaces and all that good stuff, but when I click on the Network Manager applet, it says 'Wired Network - not managed'. I may have deleted it for some reason, but why does it no longer appear, even though eth0 is working? I've also found in the past (HowTos)