How to disable systemd-resolved in Ubuntu

README.md

How to disable systemd-resolved in Ubuntu

Stages

• Disable and stop the systemd-resolved service:

    sudo systemctl disable systemd-resolved.service
    sudo systemctl stop systemd-resolved
  

• Then put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf:

    dns=default
  

• Delete the symlink /etc/resolv.conf

    rm /etc/resolv.conf
  

• Restart network-manager

    sudo service network-manager restart
    or
    sudo systemctl restart NetworkManager.service
  

Sources

• https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu

Don't forget to add back the resolv.conf:

echo 'search example.com' > /etc/resolv.conf
echo 'nameserver 1.1.1.1' >> /etc/resolv.conf
echo 'nameserver 1.0.0.1' >> /etc/resolv.conf

systemd-resolvwhatever broke after upgrading ubuntu, and it was easier to just switch back to the Thing That Always Worked than to try to figure it out.

Following these steps on a fresh Ubuntu 22.10 install completely breaks dns

Local dns servers are perfectly functional, Ubuntu sees them and they show in network config, but it refuses to use them, what gives?

How do you solve the DNS issue for 22.10 please?

root@www::> systemctl disable systemd-resolved
root@www::> systemctl stop systemd-resolved
root@www::> rm -f /etc/resolv.conf
root@www::> cat < /etc/resolv.conf
nameserver 9.9.9.9
nameserver 8.8.8.8
nameserver 1.1.1.1
EOF
root@www:~:> reboot

Why not just rename instead of remove?

mv /etc/resolv.conf /etc/resolv.conf.del

@euntae: With just stopping instead of also disabling systemd-resolved it will be active again after a reboot but the way you described it the entries in resolv.conf won't get used anyway at least on Ubuntu 24.

I was going crazy with this on the steam deck. NetworkManager kept creating a resolv.conf always pointing to 127.0.0.53.
Until I found that SteamOS (arch in disguise) had created a /etc/NetworkManager/conf.d/dns with a
[main]
dns=systemd-resolved
And that was being used instead of my conf file with dns=default...