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I installed Ubuntu 18.04.1 LTS alongside Windows 10. When I turned on Wifi, it detected the network from my router but it was unable to connect and the network soon disappeared. I then tried using my mobile hotspot and the same thing happened.

I tried editing the /etc/network/interface file and commenting out the following two lines.

auto lo

iface lo inet loopback

After doing this, I tried my mobile hotspot which worked but only for very short duration (around half a minute). My main network still doesn't work and occasionally disappears.

I have tried plugging the Ethernet cable into my laptop but that has also failed. What should I do?

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