Docker pi-hole admin page showing "lost connection to API" after upgrade to ubuntu 18.04

[donmiguel]

Please follow the below template, it will help us to help you!

Expected Behaviour:

admin dashboard should load correctly

Actual Behaviour:

dashboard shows "lost connection to API"

Debug Token:

4jzrp6h80w

[technicalpyro]

This thread has the info you should need

[donmiguel]

Hey,
Thanks for checking but I don't think that's the issue - systemd-resolved was already disabled before I upgraded the Ubuntu version. This is how it looks now:
root@teevee:~# systemctl status systemd-resolved
● systemd-resolved.service - Network Name Resolution
Loaded: loaded (/lib/systemd/system/systemd-resolved.service; disabled; vendor preset: enabled)
Active: inactive (dead)
Docs: man:systemd-resolved.service(8)
https://www.freedesktop.org/wiki/Software/systemd/resolved
https://www.freedesktop.org/wiki/Software/systemd/writing-network-configuration-managers
https://www.freedesktop.org/wiki/Software/systemd/writing-resolver-clients

And nothing is listening on port 53:
root@teevee:~# netstat -anp | grep 53 | grep -i listen
tcp6 0 0 :::53 :::* LISTEN 10095/docker-proxy

and I can see queries in the pihole.log

To add to the original error report (something I should have put in there originally, but oh well) - I had to start lighttpd manually via /etc/init.d/lighttpd start, it did not start automatically

[technicalpyro]

@donmiguel

tcp6 0 0 :::53 :::* LISTEN 10095/docker-proxy

something is using 53 unless that is your dockerized instance

please try from within your container sudo service pihole-FTL start

[donmiguel]

Ah, it turns out your first reply was on-point i implemented exactly what the article said, and now pihole works perfectly. Thanks very much for your help!
For future visitors: in Ubuntu 18.04, simply disabling systemd-resolved is not sufficient, please implement the steps in the link provided by technicalpyro