IF changing theme from light to dark and navigating away to different page. Theme will be again light

That would explain why your installation has failed the way it did. :wink: You shouldn't do that in general, and also it is specifically not required to install Pi-hole. Pi-hole's installation script handles necessary access control itself.

The setting is stored in your browser. Try disabling any browser plugins and maybe privacy options and try again. Then continue to re-enable them until you find who is causing the trouble.

I tried with resetted browser and incognito mode. Still the same

You may have clicked on the wrong Save button. Click the one marked directly below Web interface settings: [pihole-dark-mode-button]

Let's look at the file permissions. sudo ls -lha /etc/pihole/*.conf

There is certainly a lot of information missing here to get down to the reasons. Which operating system/device did you install your Pi-hole on? Which browser/operating system are you using when you try to change the theme? What is the output of grep THEME /etc/pihole/setupVars.conf ?

Debian 10 Chrome/Edge on any win10 PC No information about THEME in setupVars.conf

Now I remember. When I updated my pihole from 4 to 5. It failed so bad that I made clean install to debian with command "curl -sSL https://install.pi-hole.net | bash". This method also not working with clean debian 10. Throws a bunch of errors and I manually fixed them step by step. Seems that every…

At the time your were running that installation command, did you perhaps try to elevate to su before doing that?

Pi-hole won't switch to Dark Mode

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raudraido August 15, 2020, 12:33pm 17

I do not remember what I did, but usually in Debian i'll use command "su root" before I start to install/configure something.