Comment 3 for bug 2230

There are no pages that link to https://launchpad.net/distros/ubuntu/+sources.

Sourcepackages have URLs like https://launchpad.net/distros/ubuntu/+source/pmount

Removing the sourcepackage name from the end gives you https://launchpad.net/distros/ubuntu/+source, which redirects to the distro page.

So, there is no reason for the +sources page to be anything but a 404 not found error.

If such errors continue to occur in the logs, we should look at the referrer information to see why.