Ubuntu – DNS resolving fails, reverts back to

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The Issue

This is has been plaguing me for a while with one of my lab servers running 18.04.

No matter how many times I set my resolv.conf file, the contents revert back to a nameserver of

The Cause

This is due to a bug in systemd that seems to have been resolved, but doesn’t seem to make it into all the versions. Based on my extensive googling (looking at first two hits).

The Fix

Run the following commands. Then edit your resolv.conf file as needed.

sudo rm /etc/resolv.conf
sudo ln -s /run/resolvconf/resolv.conf /etc/resolv.conf
systemctl restart resolvconf

Note: the resolv service needs installing for this to work

sudo apt-get install -y resolvconf




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