[fprint] could not open device R61i / Ubuntu Studio

[collectif Fossile]

Hi everybody !
 
we are a french group of artists, currently developping an installation in-situ in Tours (France).
The whole work deals with fingerprints considered as a graphical element and a way to question people about biometry.
 
Our installation (temporarily named "digimap") uses a microsoft fingerprint reader on ubuntu studio. We're not using the authentification functions yet, and all we have to do is to detect the presence of a finger on the device, scan it and use binarization and minutiae detection functions. 
I've been compiling libfprint 0.0.6 (thanks for this release !) on an old Toshiba laptop running Ubuntu and it works great. Our device would not be detected with 0.0.5 version.
 
The actual problem is that I would like to use the same device on a Lenovo R61i 7650 A9G with Ubuntu studio. I've installed the same .dev libraries we needed to run it on Ubuntu, but it doesn't work! In Fprint demo, the device is detected (it flashes red lights) and the required driver is identified (URU4000), but the dialog box says "Could not open device"
 
As I'm a newbie to Linux, Ubuntu, and Libfprint, Il would appreciate very much any troubleshooting suggestion or related experiences ! The first version of our project is supposed to be ready and on 15th march.
 
thanks a lot !
 
Samuel for the Collectif Fossile
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