As seen in attached files, this is Xubuntu 18.04, where lightdm is
default, no significant local customization.

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  Unlocking existing session often requires several attempts.

Status in lightdm package in Ubuntu:

Bug description:
  # Context

  * Computer with several X sessions opened.
  * Users switching from one opened session to another.
  * Lightdm opens new greeter, wait for typing password.
  * User types password.
  * Password is accepted.
  * System closes the current greeter (screen gets black for an instant).

  # Expected

  * User gets back to their already opened session.

  # Observed

  * System immediately opens another greeter.
  * User has to type password again.

  # Reproducible

  * Not always. At times, often, at other times, rare.

  # Additional information

  Users switch session via 
  dm-tool switch-to-user $OTHERUSER
  but I guess bug appears with other means (like menu item like "lock screen", 

  # Information requested

  lsb_release -rd

  Description:  Ubuntu 18.04 LTS
  Release:      18.04

  LC_ALL=C apt-cache policy lightdm

    Installed: 1.26.0-0ubuntu1
    Candidate: 1.26.0-0ubuntu1
    Version table:
   *** 1.26.0-0ubuntu1 500
          500 bionic/universe amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: lightdm 1.26.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18
  Uname: Linux 4.15.0-23-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Tue Jun 12 14:14:52 2018
  ExecutablePath: /usr/sbin/lightdm
  InstallationDate: Installed on 2018-05-25 (18 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 
   PATH=(custom, no user)
  SourcePackage: lightdm
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.logrotate.d.lightdm: [modified]
  mtime.conffile..etc.logrotate.d.lightdm: 2018-05-25T06:19:22.081830

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