Hi,
Add the following here and try:
$ cat /etc/apache2/mods-available/userdir.conf
<IfModule mod_userdir.c>
UserDir public_html
UserDir disabled root
<Directory /home/*/public_html>
AllowOverride FileInfo AuthConfig Limit
Options MultiViews Indexes SymLinksIfOwnerMatch
IncludesNoExec
AddHandler cgi-script .cgi
</Directory>
</IfModule>
M