If the only reason for bug 126801 being private is that it contains private data, and there is no reason for the other reports being private, one of the public reports should become the canonical version, because that results in more people who can learn about (and therefore fix) the bug. So someone with access should mark bug 126801 as a duplicate of either bug 122971 or bug 124233, whichever is most useful.
So I guess the only bug in Launchpad here is that you should be able to reverse "public X is duplicate of private Y" to "private Y is duplicate of public X" without having special access to Y. Stéphane, does that sound reasonable? If so I'll update this report to reflect that request.
If the only reason for bug 126801 being private is that it contains private data, and there is no reason for the other reports being private, one of the public reports should become the canonical version, because that results in more people who can learn about (and therefore fix) the bug. So someone with access should mark bug 126801 as a duplicate of either bug 122971 or bug 124233, whichever is most useful.
So I guess the only bug in Launchpad here is that you should be able to reverse "public X is duplicate of private Y" to "private Y is duplicate of public X" without having special access to Y. Stéphane, does that sound reasonable? If so I'll update this report to reflect that request.