Debug the NUCLEO-L476RG in linux
Thanks Tarek for your answer.
The board is connected to USB2 port, but this morning I solved my issue downloading the latest version of the stlink firmware and upgrading it.
http://www2.st.com/content/st_com/en/products/embedded-software/development-tool-software/stsw-link007.html#
than:
java -jar STLinkUpgrade.jar