linux出現錯誤:Bringing up interface eth0: Error: Connection activation failed: Device not managed by NetworkManager or unavailable
解決辦法:
# service NetworkManager stop 停止NetworkManager 服務
# chkconfig NetworkManager off 關閉NetworkManager隨系統啓動
# service network restart 重啓網絡服務
# chkconfig network on 網絡服務設爲開機自動啓動