creates this symboliclink:
sudo ln -s /etc/apache2/mods-available/include.load /etc/apache2/mods-enabled
Open your default file in etc/apache2/sites-enabled/default
Edit it and add +Includes and this two lines
AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
The file should be like this:
ServerAdmin webmaster@localhost
DocumentRoot /var/www
Options FollowSymLinks
AllowOverride None
Options Indexes FollowSymLinks MultiViews +Includes
AllowOverride None
Order allow,deny
allow from all
AddType text/html .shtml
AddOutputFilter INCLUDES .shtml
ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
AllowOverride None
Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
Order allow,deny
Allow from all
ErrorLog /var/log/apache2/error.log
# Possible values include: debug, info, notice, warn, error, crit,
# alert, emerg.
LogLevel warn
CustomLog /var/log/apache2/access.log combined
Alias /doc/ "/usr/share/doc/"
Options Indexes MultiViews FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
Allow from 127.0.0.0/255.0.0.0 ::1/128
restart apache: sudo /etc/init.d/apache2 restart