53/tcp: address already in use

1. Edit /etc/systemd/resolved.conf with a text editor (as root), e.g. open it with Nano console text editor:

sudo nano /etc/systemd/resolved.conf

And uncomment (remove # from the front of the line) the DNS= line and the DNSStubListener= line. Next, change the DNS= value in this file to the DNS server you want to use (e.g. 127.0.0.1 to use a local proxy, 1.1.1.1 to use the Cloudflare DNS, etc.), and also change the DNSStubListener= value from yes to no.

This is how the file should look after you’ve made these changes (I’m using 1.1.1.1 as the DNS server here, which is the Cloudflare DNS):

[Resolve]
DNS=1.1.1.1
#FallbackDNS=
#Domains=
#LLMNR=no
#MulticastDNS=no
#DNSSEC=no
#DNSOverTLS=no
#Cache=no
DNSStubListener=no
#ReadEtcHosts=yes

To save the file using Nano text editor, press Ctrl + x, then type y and press Enter.

2. Create a symbolic link for /run/systemd/resolve/resolv.conf with /etc/resolv.conf as the destination:

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

Here, -s is for creating a symbolic and not hard link, and -f is for removing any existing destination files (so it removes /etc/resolv.conf if it exists).

3. Reboot your system.