Comment 2 for bug 411068

>As a cheap but slow workaround we could just change the rename to a copy. It would probably be a cheap fix if you'd like to try.

Yes. I'd like to have some patch. Is it possible?
I'm now in the middle of update operation which gives just the same error.

About the rest - yes, you caught the idea right. Moving .bzr to /usr partition solves the problem in my example.