Fingreprint reader

in Dell vastro 3578 laptop , i have a fingreprint hardware but i don’t know how to activate it . I find some code for this but in the second code some error comes as output please read and sovle it

1.sudo apt-add-repository ppa:fingerprint/fingerprint-gui && sudo apt-get update

2.sudo apt-get install libbsapi policykit-1-fingerprint-gui fingerprint-gui

and the error is
dpkg was interrupted, you must manually run ‘sudo dpkg --configure -a’ to correct the problem

So, do it.
sudo dpkg --configure -a

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I’ve moved this to the category because this site isn’t designed to take tech support questions. Sorry. I’d recommend using one of the official support channels listed on the page.