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I installed ubuntu server when I was not plugged into the network. I selected configured network at a later time when it asked about DHCP.

How do I now install the network?

There is no eth0 entry in the interfaces file.

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up vote 2 down vote accepted

See here for basic networking steps on Ubuntu.

sudo lshw -class network

will list all network interfaces on your server.

Detailed official documentation from ubuntu.com for servers goes here.

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