Messed up my install

I'm sure I made a simple mistake along the way.

I have a raspberry pi running raspbian Jesse.
I found several articles talking about setting up various remote storage systems, including at least three for owncloud. When I type in my ip address I get a standard gnixn webpage. If I add /owncloud I get the same thing.
I'm not surewhere things are pointing. I know I have a /var/www/owncloud directory.

I guess my question is, how does my server know where to look for the right index.htlm file.

Steps to reproduce

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2.
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Expected behaviour

Tell us what should happen

Actual behaviour

Tell us what happens instead

Server configuration

Operating system:

Web server:

Database:

PHP version:

ownCloud version: (see ownCloud admin page)

Updated from an older ownCloud or fresh install:

Where did you install ownCloud from:

Signing status (ownCloud 9.0 and above):

Login as admin user into your ownCloud and access 
http://example.com/index.php/settings/integrity/failed 
paste the results into https://gist.github.com/ and puth the link here.

The content of config/config.php:

Log in to the web-UI with an administrator account and click on
'admin' -> 'Generate Config Report' -> 'Download ownCloud config report'
This report includes the config.php settings, the list of activated apps
and other details in a well sanitized form.

or 

If you have access to your command line run e.g.:
sudo -u www-data php occ config:list system
from within your ownCloud installation folder

*ATTENTION:* Do not post your config.php file in public as is. Please use one of the above
methods whenever possible. Both, the generated reports from the web-ui and from occ config:list
consistently remove sensitive data. You still may want to review the report before sending.
If done manually then it is critical for your own privacy to dilligently
remove *all* host names, passwords, usernames, salts and other credentials before posting.
You should assume that attackers find such information and will use them against your systems.

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: local/smb/sftp/...

Are you using encryption: yes/no

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/...

LDAP configuration (delete this part if not used)

With access to your command line run e.g.:
sudo -u www-data php occ ldap:show-config
from within your ownCloud installation folder

Without access to your command line download the data/owncloud.db to your local
computer or access your SQL server remotely and run the select query:
SELECT * FROM `oc_appconfig` WHERE `appid` = 'user_ldap';


Eventually replace sensitive data as the name/IP-address of your LDAP server or groups.

Client configuration

Browser:

Operating system:

Logs

Web server error log

Insert your webserver log here

ownCloud log (data/owncloud.log)

Insert your ownCloud log here

Browser log

Insert your browser log here, this could for example include:

a) The javascript console log
b) The network log 
c) ...

would be nice to have a little more info about your setup. can you post your config.php?
its in /var/www/owncloud/config/config.php

did you create an owncloud.conf in your apache dir?

what manual / doc / how to did you follow to install owncloud?

First of all, thank you.
I read the auto added part and ran pi@raspberrypi:/var/www/owncloud $ sudo -u www-data php occ config:list system
ownCloud is not installed - only a limited number of commands are available

[Symfony\Component\Console\Exception\CommandNotFoundException]
There are no commands defined in the
"config" namespace.

So it lookslike I didn't actually install it.
I used the first link on the owncloud website. I'll try to get to s computer as typing on my phone is tough.
My confog.php is blank

you killed you config.php - can you recover it? if not there is nothing we can do

That's probably my problem.
What's the best way to do an uninstall/reinstall?
sudo apt-get remove owncloud?
Maybe with the --purge option?

just open your installation in the browser and the install screen will pop up

Ha, the funny thing is if done all of this headless.