I have a Thinkpad X1 Carbon. I followed [these instructions](https://launchpad.net/~fingerprint/+archive/fingerprint-gui), but to no avail.

The output of `lsusb` is:

```
sguha@ajgubi:~$ lsusb  
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub  
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub  
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub  
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub  
Bus 001 Device 003: ID 147e:2020 Upek  
Bus 001 Device 004: ID 5986:0266 Acer, Inc

```