The python bindings for the usb-widget are not correctly generated when building against gtk2. This commit fixes this: http://cgit.freedesktop.org/spice/spice-gtk/commit/?id=a7565265532f6abec0fd3c6d843683b58eee070a
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.