Configure fingerprint scanner (finger print) in Ubuntu 9.04

Writing this topic led me to replace the laptop and move to the beta of Ubuntu 9.04, as a result of this significant event.
I must say that I have been using this worthy product since version 7.10. During this time, several machines have changed, and I have never had to greatly regret my choice, because there were no problems with the definition of equipment, though it may be more due to the fact that the IBM Thinkpad technology I used was always well supported in Linux, like all what's done at IBM.
Now for work, I got a decent product from HP - the nc6400 laptop. This device has a fingerprint scanner, which somewhat simplifies life in our password chaos. So far, the use of the scanner has been limited to MS Windows and I have not imagined that the community is engaged in such unpopular devices.

Having installed beta 9.04 on a laptop, it was found that “out of the box” all the equipment that was present on board was recognized, including a modem (!), Which I had never seen before. As a bonus in the list of USB devices, the Fingerprint Scanner AES2501, which the truth has never been used, has become noticeable.
Googling, I found a method for connecting this device, which turned out to be quite simple.
Type in the terminal command:

sudo aptitude install fprint-demo libpam-fprint libfprint0

Alternatively, you can search in the synaptic modules containing the name fprint and install them.
These are two libraries containing support for the actual finger scanners and connecting them to the authentication module, as well as a graphical application that allows you to customize the types and number of fingers involved in the "identification" :)

After that, you need to make changes to the file authentication command
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sudo gedit /etc/pam.d/common-auth

adding a line

auth sufficient pam_fprint.so

before the line

auth [success=1 default=ignore] pam_unix.so nullok_secure

This will allow you to use the standard password entry procedure, if for some reason the fingers are not recognized.
The identification procedure displays a message on which finger to apply, but in some applications this message is suppressed, and it was too lazy to look for how to remove it. Therefore advice: identify one of the fingers and apply only it - do not get confused :).
That's all. Use on health. I would be glad if someone helped to use a hitherto useless device.
In the connection materials used article
PS Since there is not enough karma for publishing in “Linux for everyone” and “Ubuntarium”, I will host it, maybe it will be useful to someone.
PSS Thanks for the karma, moved to ubuntarium.

A very worthy link for those who want to delve into the topic, from AccessForbidden