Problem
I upgraded my Ubuntu from 16.04 to 18. And the Internet stopped working. 😦
I tried rebooting interface, adding a new interface to ifconfig. But it did not help.
What helped was an answer on AskUbuntu
How it worked?
The answer is in how Ubuntu lookup domains like http://www.google.com.
Step 1
Check the domain in the local DNS, also called a DNS stub.
Step 2
If Step 1 fails (local DNS lookup is amiss), it contacts a public DNS such as8.8.8.8also called Google Public DNS.
Since after the upgrade public DNS was not set, the internet seemed inaccessible!
How to Update Public DNS?
open /etc/resolv.conf
Add DNS=8.8.8.8
Done 🙂
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