The title says it all. I installed linux mint 18 and the LAN doesn't work. It is stuck in a chain of trying to connect and disconnecting. The same thing happened when my wireless wouldn't authenticate. The problem is that I now can't install any updates because of my internet not working.
I have an HP Probook 450. If anyone can help, it would be much appreciated!

Please help

I didn't find the right solution from the internet.

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Thank you