[Bug 1733557] Re: Login screen showing Authentication Failure Switch to greeter...

[Mathew Hodson]

** Description changed:

- When I lock my machine, the login screen shows my current user with the
- message: "Authentication Failure"
+ [Impact]
  
- ..and in the position when the password normally exists, the option
- "Switch to greeter..."
+ 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.
- 
- 
- ProblemType: Bug
- DistroRelease: Ubuntu 17.10
- Package: gnome-control-center 1:3.26.1-0ubuntu5
- ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
- Uname: Linux 4.13.0-16-generic x86_64
- ApportVersion: 2.20.7-0ubuntu3.5
- Architecture: amd64
- CurrentDesktop: Unity:Unity7:ubuntu
- Date: Tue Nov 21 10:28:47 2017
- InstallationDate: Installed on 2017-04-17 (217 days ago)
- InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
- ProcEnviron:
-  LANGUAGE=en_GB:en
-  PATH=(custom, no user)
-  XDG_RUNTIME_DIR=<set>
-  LANG=en_GB.UTF-8
-  SHELL=/bin/bash
- SourcePackage: gnome-control-center
- UpgradeStatus: Upgraded to artful on 2017-10-23 (29 days ago)

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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:
  New
Status in unity source package in Bionic:
  New
Status in unity source package in Cosmic:
  Fix Committed

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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