DNS service not running (clean install Ubuntu 20.04)

[networkDude]

hi guys,
Just installed a pi-hole on an existing server machine (ubuntu 20.04) which is rather clean. Installation went smooth, however at the end I receive the following error: " [✗] DNS service is NOT running "
In the dashboard this is confirmed, together with an error message for FTL.
Any idea how to fix this, because a forum and google search did not bring me closer to a solution. Please see below output + token

Debug Token:

Your debug token is: https://tricorder.pi-hole.net/aoalf0mtvx

[Bucking_Horn]

Your pihole-FTL failed to bind port 53.

What's the output of

sudo systemctl status --full --no-pager pihole-FTL.service

And as it's Ubuntu, what's the output of

ls -lah /etc/dnsmasq.d/

[networkDude]

hi there, thanks for your reply.

Her's: the output:

● pihole-FTL.service - LSB: pihole-FTL daemon
     Loaded: loaded (/etc/init.d/pihole-FTL; generated)
     Active: active (exited) since Wed 2020-11-11 18:02:59 UTC; 1h 53min ago
       Docs: man:systemd-sysv-generator(8)
    Process: 12223 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/SUCCESS)

Nov 11 18:02:59 homeserver systemd[1]: Starting LSB: pihole-FTL daemon...
Nov 11 18:02:59 homeserver pihole-FTL[12223]: Not running
Nov 11 18:02:59 homeserver su[12243]: (to pihole) root on none
Nov 11 18:02:59 homeserver su[12243]: pam_unix(su:session): session opened for user pihole by (uid=0)
Nov 11 18:02:59 homeserver su[12243]: pam_unix(su:session): session closed for user pihole
Nov 11 18:02:59 homeserver systemd[1]: Started LSB: pihole-FTL daemon.

and:

xx@homeserver:~$ ls -lah /etc/dnsmasq.d/
total 20K
drwxr-xr-x   2 root root 4.0K Nov 11 12:59 .
drwxr-xr-x 113 root root  12K Nov 11 12:59 ..
-rw-r--r--   1 root root 1.5K Nov 11 12:59 01-pihole.conf
lrwxrwxrwx   1 root root   28 Feb 14  2019 lxd -> /etc/dnsmasq.d-available/lxd

[Bucking_Horn]

If you aren't working with lxd containers, remove those lxd files.

Then run

pihole restartdns

[networkDude]

Thanks a lot for your support, that was indeed the solution. Everything working smoothly now.

Greets,
Olivier

[Coro]

@Bucking_Horn I've seen this lxd a couple of times now. Do you think it'd be time to alert the core developers to add a check to the installer script?

[Bucking_Horn]

I think they are well aware of it.

I've been long wondering what triggers creation of those lxd files, and if they are indeed present at the time of Pi-hole's installation.
Personally, I haven't seen them when I last setup Ubuntu (that was 18).

Maybe you have the time to investigate?

Also, there are other instances where extra dnsmasq configuration interferes with Pi-hole's operation, e.g. PiVPN, raspAP, and some other third-party tools.
I'd probably prefer an addition to the debug log instead.