I am also encountering this issue on Debian 10, but I upgraded to 5.2 from 5.1.
I am unable to change any of the DNS settings they all revert after clicking save.
I was able to set the variables in /etc/pihole/setupVars.conf, and the values show up in the WebGUI, it it does not seem to enable the behavior.
You mentioned that there was a problem with the install script for Debian, have you discovered a way to repair an installation?
Did you run into errors when installing Pi-hole?
Pi-hole uses values in setupVars.conf during installation and updates.
It is not meant to be edited manually.
You may try to run
pihole -r
If that doesn't fix your issue, please provide a debug token.
No, I think I did fix it but actually not. Some point my DNS resolver didn't work over the VPN. I were quite sure that something else was broken, but after pihole clean install, everything started to work again.
I did initially encounter an issue where I didn't have the correct version of php installed, but once I fixed that there were no further errors.
Your suggested command seems to allow Conditional forwarding to work, but I am still having the issue where I cannot make any changes from the GUI.
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