libfprint0 in Trisquel 6.0 is too old to support this device. Build it from upstream git using commands like these:

sudo aptitude install git
sudo aptitude build-dep libfprint0
git clone git://anongit.freedesktop.org/libfprint/libfprint
cd libfprint
./autogen.sh --prefix=$HOME/.local
make -j3
make install

sudo LD_LIBRARY_PATH=$HOME/.local/lib fprint_demo

lsusb:

Bus 001 Device 003: ID 08ff:2810 AuthenTec, Inc. AES2810

lsusb -v:

Bus 001 Device 003: ID 08ff:2810 AuthenTec, Inc. AES2810
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass          255 Vendor Specific Class
  bDeviceSubClass       255 Vendor Specific Subclass
  bDeviceProtocol       255 Vendor Specific Protocol
  bMaxPacketSize0         8
  idVendor           0x08ff AuthenTec, Inc.
  idProduct          0x2810 AES2810
  bcdDevice           17.03
  iManufacturer           0 
  iProduct                1 
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              0 
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval               0