I have been using dual boot OS one is windows 10 and another Os is Ubuntu 14.04. in windows10 ethernet working perfectly fine.but when I using ubuntu it showing ethernet cable is unplugged. I have changed the LAN wire but no use. am kind of new to ubuntu please help me? I have read similar questions here but no solution given by anyone. System Information:

Dell Vostro 3000 series; 3gb Ram 500gb hardisk

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    Please edit the question to include the results of lspci – sempaiscuba Apr 30 '17 at 6:54

I had this kind of trouble, I'm not sure is the best way but it use to help doing :

sudo ifconfig eth0 down

sudo ifconfig eth0 up

depending on your system "eth0" may be something else, just have a look whith

sudo ifconfig

This will show you all your interfaces

hope this help !

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