STLINK cannot detect my STM32VL discovery

I'm working on a debian 6.0 installed on virtualbox 4 hosted by Windows7, and I'm trying to get my STM32VL work using STLINK project that allows programming and debugging STM32 on Linux. I followed their tutorial and installed all needed dependancies.
But when I run the program ./​​st-util -1, I get the following error:

tbarry@darkstar:~/stlink$ ./st-util -1
2014-03-20T10:18:48 WARN src/stlink-sg.c: Failed to find an stlink v1 by VID:PID
Error: could not open stlink device
Error: could not open stlink device

I underline that I have already installed Virtualbox extensions, and usb 2.0 is well handled.
Does anyone have an idea of ​​what is blocking me?

Not having found a solution to my problem, I tried with VMware player and it worked nice.
Conclusion: Whatever the problem I had, it was coming from VirtualBox.