Public bug reported:

ATTN: Ubuntu Mate Developers

Description:    Ubuntu 18.04 LTS
Release:        18.04

lightdm:
  Installed: 1.26.0-0ubuntu1
  Candidate: 1.26.0-0ubuntu1
  Version table:
 *** 1.26.0-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status

In Ubuntu Mate 18.04 LTS LightDM, I created a file in
/etc/lightdm/lightdm.conf, with the line:

allow-guest=true

This allows me to log into a guest session. The issue is when I try to
switch between the guest session and a normal session and back.
Switching from guest session to the normal user session is fine. LightDM
asks for the normal user password. However, when I try to switch from
the normal user to back to the guest session I am asked for password as
well. This is the problem as the guest session has no known password.
The unlock window has a 'Switch User" button along with Cancel, etc.
Clicking the "Switch User" button takes me to the standard LightDM
screen. There I can select from the normal user and the guest. However,
selecting guest here opens a new guest session, and does not take me
back to the guest session already open.

This looks like an old bug https://bugs.launchpad.net/bugs/1481804

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Jun  4 17:46:33 2018
InstallationDate: Installed on 2018-05-31 (4 days ago)
InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 
(20180426)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1775088

Title:
  Ubuntu Mate guest session locked out when switching from another
  account

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