I have a dual-boot laptop (asus k53sv) ubuntu 12.04.2 LTS and windows 8. My wired internet connection on windows 8 works fine but on ubuntu I cannot connect to the internet. In order to connect to the internet, I must restart the modem (yes I can access the setup page of the modem) but when I re-plug the cable or restart ubuntu, I cannot access the internet anymore.
sudo lshw -C network: http://paste.ubuntu.com/5603124/
ifconfig -a: http://paste.ubuntu.com/5603126/
My wired network adapter is "RTL8111/8168B PCI Express Gigabit Ethernet controller". I have changed the driver r8169 to r8168 but it doesn't help.
P/S: (1) When I cannot connect to the internet, I can access the modem's setup page. (2) But when I have the internet connection (after restarting the modem), I cannot access the setup page (I was prompted for the password but it doesn't accept my password). And when I re-plug the cable or the reboot ubuntu, I'm back to (1).
Could someone help me to ge rid of this annoying problem? Many thanks :-).