Could not move Updates.xml to target location. Error: Destination file exists

I created online installer and tested those ok for a while. While testing
my custom part I always canceled the installation after first "Next" button press. During the testing phase the online installer got "stuck" in a state it could not locate the online repository (due to my testing env).

After a while with a new online installer I tried to run it (using default installation directory) it gives the following error message:

Creating meta data directory at "/tmp/remoterepoM27546meta"
Could not move Updates.xml to target location. Error: Destination file exists
Could not move Updates.xml to target location. Error: Destination file exists

This happened on Linux-x64 system. Similar report exists in Qt5.1.1 blog post, that happened one time with Windows system.

Edit:

There seems to be some kind of correlation with the amount of online repositories and the failures. Tested with split repositories (i.e. more repositories than before) and about every third installation fails because of this issue now. Raising to P0.