after opening http 127.0.0.1 in the browser it displays info:

It works! This is the default web page for this server. The web server
software is running but no content has been added, yet.

The point is I have added files to the DocumentRoot catalog

Things i changed:
/etc/apache2/envvars

from

export APACHE_RUN_USER=www-data

export APACHE_RUN_GROUP=www-data

to

export APACHE_RUN_USER=chiny 

export APACHE_RUN_GROUP=chiny

file /etc/apache2/sites-enabled/000-default.conf looks:

<VirtualHost *:80>

        ServerAdmin webmaster@localhost

        DocumentRoot /home/chiny/Pulpit/lab





<Directory /home/chiny/Pulpit/lab/>

        Options Indexes FollowSymLinks MultiViews

        AllowOverride None

        Require all granted

    Allow from all

</Directory>



    # 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







    # 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

my DocumentRoot where i have my html files

root@chiny-HP-Compaq-dc7100-CMT-DX438AV:/home/chiny/Pulpit/lab# ls -l /home/chiny/Pulpit/lab 

razem 60 

-rwxrwxr-x 1 chiny chiny 3096 sty 18  2013 10.html 

-rwxrwxr-x 1 chiny chiny 2562 sty 18  2013 11.html 

-rwxrwxr-x 1 chiny chiny 3010 sty 18  2013 12.html 

-rwxrwxr-x 1 chiny chiny 3045 sty 18  2013 1.html 

-rwxrwxr-x 1 chiny chiny 3016 sty 18  2013 2.html 

-rwxrwxr-x 1 chiny chiny 2772 sty 18  2013 3.html 

-rwxrwxr-x 1 chiny chiny 2814 sty 18  2013 4.html 

-rwxrwxr-x 1 chiny chiny 2638 sty 18  2013 5.html 

-rwxrwxr-x 1 chiny chiny 2794 sty 18  2013 6.html 

-rwxrwxr-x 1 chiny chiny 2722 sty 18  2013 7.html 

-rwxrwxr-x 1 chiny chiny 2591 sty 18  2013 8.html 

-rwxrwxr-x 1 chiny chiny 2620 sty 18  2013 9.html 

-rw-r--r-- 1 chiny chiny  177 sty 18 18:37 index.html 

-rwxrwxr-x 1 chiny chiny    0 sty 18 14:43 plik 

-rwxrwxr-x 1 chiny chiny 1711 sty 17  2013 styles.css 

-rwxrwxr-x 1 chiny chiny 3181 sty 17  2013 w3schoolslogo.gif 

also /home/chiny/Pulpit/lab is owned and group by chiny

drwxrwsr-x 2 chiny chiny  4096 sty 18 18:37 lab

nothing changed in apache2.conf

after restarting apache this info:

root@chiny-HP-Compaq-dc7100-CMT-DX438AV:/home/chiny/Pulpit# /etc/init.d/apache2 restart 

 * Restarting web server apache2                                                             AH00557: apache2: apr_sockaddr_info_get() failed for chiny-HP-Compaq-dc7100-CMT-DX438AV 

AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1. Set the 'ServerName' directive globally to suppress this message