commands pi4

Buenos días.
@egrueda
Perdon por la tardanza, ayer fue imposible seguir con el proyecto.
Te pongo aqui las salidas de los comandos que me sugeriste ayer. Más el resultado del comando cd /var/www/owncloud (así comprobé si lo tenía o no creado - corrigeme si hice mal, por fa!).
"pi@raspberrypi:~ $ systemctl status apache2
● apache2.service - The Apache HTTP Server
   Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
   Active: active (running) since Sat 2020-01-04 10:22:59 CET; 24h ago
     Docs: https://httpd.apache.org/docs/2.4/
  Process: 416 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCESS)
  Process: 1098 ExecReload=/usr/sbin/apachectl graceful (code=exited, status=0/SUCCESS)
 Main PID: 562 (apache2)
    Tasks: 6 (limit: 1599)
   Memory: 31.2M
   CGroup: /system.slice/apache2.service
           ├─ 562 /usr/sbin/apache2 -k start
           ├─1140 /usr/sbin/apache2 -k start
           ├─1142 /usr/sbin/apache2 -k start
           ├─1143 /usr/sbin/apache2 -k start
           ├─1144 /usr/sbin/apache2 -k start
           └─1145 /usr/sbin/apache2 -k start

ene 04 10:22:58 raspberrypi systemd[1]: Starting The Apache HTTP Server...
ene 04 10:22:59 raspberrypi apachectl[416]: AH00112: Warning: DocumentRoot [/var/www/owncloud.
ene 04 10:22:59 raspberrypi apachectl[416]: AH00558: apache2: Could not reliably determine the
ene 04 10:22:59 raspberrypi systemd[1]: Started The Apache HTTP Server.
ene 05 10:23:45 raspberrypi systemd[1]: Reloading The Apache HTTP Server.
ene 05 10:23:45 raspberrypi apachectl[1098]: AH00112: Warning: DocumentRoot [/var/www/owncloud
ene 05 10:23:45 raspberrypi apachectl[1098]: AH00558: apache2: Could not reliably determine th
ene 05 10:23:45 raspberrypi systemd[1]: Reloaded The Apache HTTP Server.
lines 1-25/25 (END)


mariadb.service - MariaDB 10.3.17 database server
   Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabl
   Active: active (running) since Sat 2020-01-04 10:23:01 CET; 24h ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/
  Process: 427 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysq
  Process: 449 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSIT
  Process: 459 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||
  Process: 594 ExecStartPost=/etc/mysql/debian-start (code=exited, status=0/SUCCESS)
  Process: 597 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSI
 Main PID: 549 (mysqld)
   Status: "Taking your SQL requests now..."
    Tasks: 31 (limit: 1599)
   Memory: 63.0M
   CGroup: /system.slice/mariadb.service
           └─549 /usr/sbin/mysqld

ene 04 10:22:58 raspberrypi systemd[1]: Starting MariaDB 10.3.17 database server...
ene 04 10:23:00 raspberrypi mysqld[549]: 2020-01-04 10:23:00 0 [Note] /usr/sbin/mysql
ene 04 10:23:01 raspberrypi /etc/mysql/debian-start[596]: Upgrading MySQL tables if n
ene 04 10:23:01 raspberrypi systemd[1]: Started MariaDB 10.3.17 database server.
ene 04 10:23:01 raspberrypi /etc/mysql/debian-start[618]: Triggering myisam-recover f
~
sudo netstat -ntpl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:3306 	  	       0.0.0.0:*               LISTEN      549/mysqld
tcp6       0      0 :::80                 			  :::*                    LISTEN      562/apache2

pi@raspberrypi:~ $ cd /var/www/owncloud
pi@raspberrypi:/var/www/owncloud $ ls
apps           console.php       etc           ocs           robots.txt
apps-external  COPYING           index.html    ocs-provider  settings
assets         core              index.php     public.php    status.php
AUTHORS        cron.php          lib           README.md     updater
CHANGELOG.md   data              occ           remote.php    version.php
config         db_structure.xml  ocm-provider  resources
pi@raspberrypi:/var/www/owncloud $

SIn embargo, en el chromium cuando pongo la ip de mi raspi con o sin /owncloud me da el erro 404 Not Found.
Pido disculpas por la "sabana" que te acabo de poner, pero más información no tengo. Intento seguir tu consejo, y poner toda la info que esta en mis manos.
Un saludo, y gracias de antemano.