Hi, I (actually my friend) figured out the problem. Yes, it is a module problem of my Network Card (Davicom kind). There is also someone else who figured out. My friend could find the post at http://www.ubuntuforums.org/showthread.php?t=186430 or search the unbuntu forrum for "How to fix problem with Davicom ethernet adapter" Thanks, Sang Chul -- goshng