Standard Pi-Hole install + LE SSL + Apache virtualhost

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Dont need to do that.
During install, you were asked two questions:

  1. Install web server (lighttpd);
  2. Install web files/interface (in /var/www/html/).

These are stored in below file:

pi@ph5b:~ $ cat /etc/pihole/setupVars.conf
[..]
INSTALL_WEB_SERVER=true
INSTALL_WEB_INTERFACE=true
[..]

So setting INSTALL_WEB_SERVER=false, makes sure that Pi-hole wont install lighttpd + PHP dependencies.
But keeping INSTALL_WEB_INTERFACE=true, makes sure the web files are installed in that /var/www/html/admin/ folder that can be used as a DocumentRoot for a VirtualHost in apache2.
Below the PHP web dependencies that are also needed for apache2:

pi@ph5b:~ $ curl -sSL install.pi-hole.net | grep -i deps
[..]
        PIHOLE_WEB_DEPS=(lighttpd lighttpd-fastcgi php-common php-cli php-pdo php-xml php-json php-intl)
[..]

And the www-data user, under which apache2 runs, needs to be a member of the pihole group to be able to write to certain locations.
With below you can check

pi@ph5b:~ $ groups www-data
www-data : www-data pihole

And below can be used if you want to add the www-data user to the pihole group:

sudo usermod -a -G pihole www-data

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