getting error while trying to flash my neo freerunner

[Detructor]

Hey guys,

I hope you can help me, I've the following problem:

When I try to flash the neo on my laptop I get a
"Starting download: [dfu_download error -71"

sometimes the download starts and then I get the error.

When I get the neo in June, I could flash it without getting this error.

My operating system: Ubuntu 8.04.1

I ask here, because I can't find anything about this error in the www
(only 3 entries in google and none of it helps).

hope for help
Detructor