Create adguardhome.conf
file
sudo mkdir /etc/systemd/resolved.conf.d
cd /etc/systemd/resolved.conf.d
sudo vim adguardhome.conf
Add following content into adguardhome.conf
file:
[Resolve]
DNS=127.0.0.1
DNSStubListener=no
Create new config file link and restart service
sudo mv /etc/resolv.conf /etc/resolv.conf.backup
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf
sudo systemctl reload-or-restart systemd-resolved