Public bug reported:

After upgrade to 16.04, any action which invokes the fingerprint scanner
(for me: unlocking screen, sudo, etc) will cause the scanner to flash
its green light until I scan my finger. Then the desired authentication
and action take place.

However, the scanner continues to flash its green light until I scan my
finger a second time.  However, this scan accomplishes nothing except to
make it stop flashing.

Also, when I log in (with my password, not fingerprint, otherwise I
won't have access to encrypted folders), the scanner flashes needlessly
until I scan once.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: fprintd 0.6.0-1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jun  3 08:55:32 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-02-12 (111 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: fprintd
UpgradeStatus: Upgraded to xenial on 2016-05-24 (9 days ago)

** Affects: fprintd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Summary changed:

- fingerprint scanner usually keeps flashing after use; requiring a second 
(meaningless) fingerprint scan
+ fingerprint scanner usually keeps flashing after use, requiring a second 
(useless) fingerprint scan

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https://bugs.launchpad.net/bugs/1588815

Title:
  fingerprint scanner usually keeps flashing after use, requiring a
  second (useless) fingerprint scan

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