If you created an empty file, you may also check the ownership to prevent permission problems.
### - Installing on Ubuntu may conflict with `systemd-resolved` - see [Installing on Ubuntu](https://github.com/pi-hole/docker-pi-hole#installing-on-ubuntu) for help.
### - Installing on Ubuntu may conflict with `systemd-resolved` - see [Installing on Ubuntu](https://github.com/pi-hole/docker-pi-hole#installing-on-ubuntu-or-fedora) for help.
### - Environment variables are version-dependent
Environment variables like "CONDIIONAL_FORWARDING*" and "DNS1" are deprecated and replaced by e.g. "REV_SERVER*" and "PIHOLE_DNS" in version 5.8+.