[Bug 1816530] [NEW] DNS servers are not being set in the system correctly when you upgrade from 16.04 to 18.04

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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.
https://askubuntu.com/questions/1021884/no-internet-after-upgrade-from-16-04-to-18-04

** Affects: resolvconf (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment
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DNS servers are not being set in the system correctly when you upgrade from 16.04 to 18.04
https://bugs.launchpad.net/bugs/1816530
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