connot connect to wired network, but wireless network works well

[rocky]

Hi.
After I upgrading to 10.10, I've got in this trouble. And I have a DHCP
server but I cannot connect to a wired network. I mean the wireless
network works well. It's nothing to do with this problem. However, if I
reboot to another OS, windows, I can connect to a wired network again.
And if I comeback to ubuntu, it works well. It fixed itself. Does anyone
know about this? Some explanation?
 Rocky