I've followed every step posted in here:
http://stackoverflow.com/questions/60736/how-to-setup-a-subversion-svn-server-on-gnu-linux-ubuntu
I'm using Ubuntu 8.10
After firing up the browser, I get
Forbidden
You don't have permission to access /svn on this server. Apache/2.2.9 (Ubuntu) DAV/2 SVN/1.5.1 mod_ssl/2.2.9 OpenSSL/0.9.8g Server at localhost Port 443