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[Launchpad Bug Tracker <1733557@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity - 7.5.0+18.04.20190304-0ubuntu1

---------------
unity (7.5.0+18.04.20190304-0ubuntu1) bionic; urgency=medium

  * lockscreen: cancel authentication if externally unlocked (LP:
    #1733557)

 -- Andrea Azzarone <andrea.azzarone@xxxxxxxxxxxxx>  Mon, 04 Mar 2019
11:03:45 +0000

** Changed in: unity (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** Changed in: unity (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1733557

Title:
  Login screen showing Authentication Failure Switch to greeter...

Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Xenial:
  Fix Released
Status in unity source package in Bionic:
  Fix Released
Status in unity source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

  After locking, the login screen shows the message "Authentication
  Failure" and the user must click "Switch to greeter" to continue.

  This SRU fixes the regression introduced in 44e6022, which causes the
  lock screen to start failing when session switching is involved. This
  can happen when you unlock the session from LightDM or from the CLI.
  We need to cancel the authentication in order to ensure that the next
  one does not fail.

  [Test Case]

  On a system with LightDM and more than one local user ("bob" and "alice"):
  1. Login under bob.
  2. Via upper-right menu switch to "alice".
  3. On greeter screen select "alice", login under alice.
  4. Logout, return to greeter screen.
  5. Select bob (already logged in). Enter password.
  6. Lock screen.

  [Other Info]

  This happens mostly after switching user sessions.
  Syslog contains entries like:
  Jan 6 17:15:42 eugene-Lenovo-Flex-2-14 compiz[1877]: WARN 2018-01-06 17:15:42 unity.lockscreen UserPromptView.cpp:500 Failed to start the authentication process. Retrying for 2 time.

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