I've followed every step posted in here:
How to set up 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
That guide was following one from '07 so I'm not too surprised not everything went as planned.
Take a look at the official docs on getting it set up.