With Ubuntu 13.04 after installing libbsapi policykit-1-fingerprint-gui fingerprint-gui, when we try running fingerprint-gui especially those who have 138a:008 (VFS301), the device would not sop after first initiation and hence you cannot proceed.
This has been fixed in the libfprint 1.5.1 version and hence download the source and compile it. Do not use the launchpad version as it has dev_open identification issue.
Also after installing make ln -s for /usr/local/lib/libfprint.s0.0.0.0 to /usr/lib/libfprint.s0.0.0.0. Otherwise it would point to the old version installed using apt-get.
This happened to me and after installing latest version of libfprint, I succeeded.