free port 53

 Steps to Disable DNSStubListener (Recommended Method)

Create a configuration file: Create or edit /etc/systemd/resolved.conf.d/no-stub.conf.
 

bash
sudo mkdir -p /etc/systemd/resolved.conf.d

echo -e "[Resolve]\nDNSStubListener=no" | sudo tee /etc/systemd/resolved.conf.d/no-stub.conf

Restart the service:
 

bash
sudo systemctl restart systemd-resolved

Update /etc/resolv.conf: If it still points to 127.0.0.53, you may need to update the symlink to use your network manager's settings or a static DNS server.
 

bash
sudo ln -sf /run/systemd/resolve/resolv.conf /etc/resolv.conf

Alternative: Stop and Disable the Service Entirely
If you don't need systemd-resolved at all, you can stop it completely: 

bash
sudo systemctl stop systemd-resolved
sudo systemctl disable systemd-resolved
Verification

Run the following command to check if port 53 is still in use: 
 

bash
sudo netstat -tlnp | grep :53

# OR

sudo ss -tulpn | grep :53

stop kvm default network

sudo virsh net-destroy default

sudo virsh net-undefine default