Ubuntu 20.04: Apache2
(01) Install Apache2
(02) Configure Virtual Hostings
(03) Configure SSL/TLS
(04) Enable Userdir
(05) Use CGI Scripts
(06) Use PHP Scripts
(07) PHP + PHP-FPM
(08) Basic Authentication
(09) Configure WebDAV Folder
(10) Basic Authentication + PAM
(11) Kerberos Authentication
(12) Configure mod_md
(13) RoundCube Web Mail