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I am using ubuntu 18.04 on HP ProBook 4540s.
Following is the output of lsusb :

Bus 002 Device 004: ID 0cf3:311d Atheros Communications, Inc. 
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 04f2:b370 Chicony Electronics Co., Ltd 
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 138a:003d Validity Sensors, Inc. VFS491
Bus 001 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 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

I can't configure the fingerprint scanner (validity VFS491, as shown in the list above). I have tried fprintd, fingerprint etc available on help forums and on hp website. Nothing seems to be working. Any help?

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Make sure that you have installed the driver from HP website

Simply just search the Serial number of the product you can get that with:

dmidecode -s system-serial-number

if the driver is installed try installing libfprint

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