Comment 6 for bug 86253

For #1, if you generate a list of all the Ubuntu wiki URLs that Launchpad currently associates with people, the sysadmins can (James tells me) compare that against the list of Ubuntu wiki pages that actually exist, to produce a list of URLs that should be removed.

I'm personally a fan of #2, on the grounds that nobody benefits from Launchpad knowing anything special about wikis (or why not "Edit Weblog URLs" and "Edit Forum IDs" pages, as well?), so you have better things to do than having to fix wiki-specific problems like bug 67646. Removing wiki URLs completely would contribute to simplifying profile-editing, too. Reasonable migration would be to append genuine wiki URLs to a person's description aka "home page" field, which would require doing #1.

#3 would dissuade some search engines but not others. And importantly, it wouldn't solve the problem for humans. Novices would be confused by the 404, while experts might reluctantly come to the conclusion that any link from a Launchpad person page to an Ubuntu wiki page is probably broken and not worth following.