Comment 9 for bug 793997

Michael, as I have understood, the UK servers are a completely different beast, it could as well be another provider. I have a user on the UK servers, the US ones doesn't even recognise me. Which could speak in the direction as making "Rackspace UK" a separate location.

I would also prefer a graphical solution over a gsettings one - The gsettings would be a temporary solution, while the usability issue was being deliberated over.

But, with some help, I found temporary "fix": Setting the environment variable
CLOUDFILES_AUTHURL=https://lon.auth.api.rackspacecloud.com/v1.0 before running deja-dup (or duplicity) does the trick.

So now, I can at least test Deja Dup (making my first backup as I type).