@cml Changing DocumentRoot did not help but changing the folder from which the content is served, did. Thanks.

@sebastian-roth Here is the output for both error.log and 000-default.conf

user@fogserver:/var/log/apache2$ cat error.log
[Thu Aug 17 11:35:51.641488 2017] [mpm_event:notice] [pid 2410:tid 139953129904000] AH00489: Apache/2.4.27 (Ubuntu) configured -- resuming normal operations
[Thu Aug 17 11:35:51.641643 2017] [core:notice] [pid 2410:tid 139953129904000] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 11:38:29.056297 2017] [mpm_event:notice] [pid 2410:tid 139953129904000] AH00491: caught SIGTERM, shutting down
[Thu Aug 17 11:38:30.136292 2017] [mpm_prefork:notice] [pid 15042] AH00163: Apache/2.4.27 (Ubuntu) configured -- resuming normal operations
[Thu Aug 17 11:38:30.136341 2017] [core:notice] [pid 15042] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 11:38:31.469636 2017] [mpm_prefork:notice] [pid 15042] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 11:38:32.622756 2017] [mpm_prefork:notice] [pid 15120] AH00163: Apache/2.4.27 (Ubuntu) configured -- resuming normal operations
[Thu Aug 17 11:38:32.622774 2017] [core:notice] [pid 15120] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 11:41:32.767524 2017] [mpm_prefork:notice] [pid 15120] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 11:42:01.438404 2017] [mpm_prefork:notice] [pid 2464] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 11:42:01.438498 2017] [core:notice] [pid 2464] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 12:47:56.650295 2017] [mpm_prefork:notice] [pid 2464] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 12:47:57.699805 2017] [mpm_prefork:notice] [pid 9398] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 12:47:57.699906 2017] [core:notice] [pid 9398] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 13:30:27.308308 2017] [mpm_prefork:notice] [pid 9398] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 13:30:28.099826 2017] [mpm_prefork:notice] [pid 12355] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 13:30:28.099922 2017] [core:notice] [pid 12355] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 13:31:52.894967 2017] [mpm_prefork:notice] [pid 12355] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 13:31:53.943244 2017] [mpm_prefork:notice] [pid 12484] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 13:31:53.943344 2017] [core:notice] [pid 12484] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 13:42:01.399065 2017] [mpm_prefork:notice] [pid 12484] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 13:42:02.450655 2017] [mpm_prefork:notice] [pid 13236] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 13:42:02.450741 2017] [core:notice] [pid 13236] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 14:38:07.578743 2017] [mpm_prefork:notice] [pid 13236] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 14:38:08.609888 2017] [mpm_prefork:notice] [pid 16725] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 14:38:08.609990 2017] [core:notice] [pid 16725] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 14:44:33.647688 2017] [mpm_prefork:notice] [pid 16725] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 14:44:34.719721 2017] [mpm_prefork:notice] [pid 17304] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 14:44:34.719820 2017] [core:notice] [pid 17304] AH00094: Command line: '/usr/sbin/apache2'
[Thu Aug 17 17:21:20.937504 2017] [mpm_prefork:notice] [pid 17304] AH00169: caught SIGTERM, shutting down
[Thu Aug 17 17:21:22.039081 2017] [mpm_prefork:notice] [pid 26671] AH00163: Apache/2.4.27 (Ubuntu) OpenSSL/1.1.0f configured -- resuming normal operations
[Thu Aug 17 17:21:22.039166 2017] [core:notice] [pid 26671] AH00094: Command line: '/usr/sbin/apache2'

user@fogserver:/etc/apache2/sites-enabled$ cat 000-default.conf
<VirtualHost *:80>
        # The ServerName directive sets the request scheme, hostname and port that
        # the server uses to identify itself. This is used when creating
        # redirection URLs. In the context of virtual hosts, the ServerName
        # specifies what hostname must appear in the request's Host: header to
        # match this virtual host. For the default virtual host (this file) this
        # value is not decisive as it is used as a last resort host regardless.
        # However, you must set it for any further virtual host explicitly.
        #ServerName www.example.com

        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/html

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        # For most configuration files from conf-available/, which are
        # enabled or disabled at a global level, it is possible to
        # include a line for only one particular virtual host. For example the
        # following line enables the CGI configuration for this host only
        # after it has been globally disabled with "a2disconf".
        #Include conf-available/serve-cgi-bin.conf
</VirtualHost>

# vim: syntax=apache ts=4 sw=4 sts=4 sr noet

Thanks. Tried it, but no luck. Still getting 404 Not Found error.

I am running version 1.4.4 SVN Revision: 6077 and am having trouble with the instructions provided here. After following the procedure, I get a 404 error when trying to access the dban folder via the browser. Also tried mouting like this:

mount -t iso9660 -o loop,uid=www-data,gid=www-data /iso/dban.iso /var/www/dban

Can anyone help?