http://ubuntu.or.kr/viewtopic.php?f=21&t=8776 



1.sudo apt-get remove --purge network-manager(설치된 네트워크 매니저 삭제)


2.sudo gedit /etc/resolv.conf(DNS)
  
      nameserver 255.255.255.255

3.sudo gedit /etc/network/interfaces


    auto eth0
    iface eth0 inet static
    address 255.255.255.255
    netmask 255.255.255.255
    gateway 255.255.255.255

4. 
sudo /etc/init.d/networking restart(네트워크 재시작)