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You may need to check /etc/network/interfaces and /etc/resolv.conf. They should have been configured, though.
/etc/network/interfaces
/etc/resolv.conf
If /etc/hosts and /etc/hostname has not been configured yet:
/etc/hosts
/etc/hostname
echo '127.0.0.1 foo.example.com foo' >> /etc/hosts echo foo > /etc/hostname hostname foo