what happens is my laptop connects to the router via lan cable but I can't access internet. while on my other laptop I can.
Thought it was a lan cable issue, so replaced it. Still the same problem and as my other laptop connects to the same router via the same lan cable there has to some problem with my laptop.
So tried changing the router but keeping the lan cable same, and I can connect to the router and access Internet as well!
So somehow I can't access internet on my laptop connected to my router via lan cable! Anyway WiFi works just fine.
Using Ubuntu 15.04 right now.
output of lspci -knn | grep Eth -A2
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 05)
Subsystem: Dell Device [1028:0597]
Kernel driver in use: r8169
lspci -knn | grep Eth -A2
terminal command.