Ubuntu

There is no internet after upgrading from Ubuntu 16.04 to 18.04

Asked by Zoltán Süle

I upgraded my 16.04 to 18.04 before the official release. After the upgrade I noticed that I don't have internet access. The wired network and the wifi settings looked good, but the internet didn't work. After the login the system always switched itself into airplane mode. I tethered the network via USB and Bluetooth by my mobile but they also didn't work.

I found a useful answer from @andrew-woodhead666:
https://answers.launchpad.net/ubuntu/+question/665374

it seems this bug is still not fixed for the upgraded dists in the main release and affects a few dozens of ubuntu users. I got a lot of answers with different approaches. Would be good to know which one is the right
https://askubuntu.com/questions/1021884/no-internet-after-upgrade-from-16-04-to-18-04

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actionparsnip (andrew-woodhead666) said : 		#1

Can you ping your default gateway IP ?
Can you ping 8.8.8.8 ?
Can you ping google.com ?
Do you use a proxy for web access ?
Do you use a VPN for web access ?

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Zoltán Süle (zoltan-sule) said : 		#2

I could ping 8.8.8.8 but
I couldn't ping google.com
I don't use proxy or VPN.

What you answered here fixes the issue, but I would say it is a bug, because after the upgrade there is no internet access for many users:
https://answers.launchpad.net/ubuntu/+question/665374

The upgrade should alter the resolvconf the right way.

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actionparsnip (andrew-woodhead666) said : 		#3

Then I suggest you report a bug

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actionparsnip (andrew-woodhead666) said : 		#4

Its just that DNS servers are not being set in the system correctly

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