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

[Łukasz Zemczak]

Hello Andrew, or anyone else affected,

Accepted unity into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/unity/7.4.5+16.04.20190312-0ubuntu1
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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

** Tags added: verification-needed-xenial

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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 Committed
Status in unity source package in Bionic:
  Fix Committed
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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