Web interface not working

[deHakkelaar]

@kingswindsor

Dec 07 18:08:12 raspberrypi lighttpd[568]: 2020-12-07 18:08:11: (plugin.c.230) dlopen() failed for: /usr/lib/lighttpd/mod_indexfile.so /usr/lib/lighttpd/mod_indexfile.so: invalid ELF header
Dec 07 18:08:12 raspberrypi lighttpd[568]: 2020-12-07 18:08:11: (server.c.1177) loading plugins finally failed
Dec 07 18:08:12 raspberrypi systemd[1]: lighttpd.service: Control process exited, code=exited, status=255/EXCEPTION

You have more issues with files corrupted.
This could go on for ever trying to fix individual files.

@Bucking_Horn

But files don't change their content by themselves, there has to be a reason why that file has been corrupted.

EDIT:

pi@ph5:~ $ dpkg -S /usr/lib/lighttpd/mod_indexfile.so
lighttpd: /usr/lib/lighttpd/mod_indexfile.so

Web Interface not reachable, pi-hole itself is working

Yes. Its not a big thing if nothing else depends on lighttpd. Purge it with below: sudo apt purge lighttpd And post output for above one here if it says it didnt remove files or folders for some reason. Those files not being removed could cause issues if proceed. To have it reinstalled and configured, run below one and select repair: pihole -r