Comment 16 for bug 709125

apt.ubuntu.com does not "deny access" to non-Ubuntu clients, and nobody has suggested that it should. That's not the issue. The issue is that it has to be able to display OS-dependent information: an installation button for the relevant package if you're running Ubuntu, or if you're running something else, information about Ubuntu and how to get it.

It's possible to tell whether a Web browser is running on Windows or not, or on Mac OS X or not. If Firefox on Ubuntu makes it impossible for us to tell whether it's running on Ubuntu or not, that's putting Ubuntu at an unfair disadvantage.