Ubuntu MATE arctica-greeter requires seleting user on first boot

[Bill (franksmcb)]

Ubuntu MATE 20.10 with arctica-greeter no longer selects username created during installation during first boot.

Per test case 1300 for Ubuntu MATE, step #20.

"The system boots properly and loads into Ubuntu MATE showing username selected at step 15"

Expected outcome:

Username created during installation is selected and user can enter password directly to login.

Actual outcome:

Instead user is required to selected the user they created during the installation process in order to be able to login.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: arctica-greeter 0.99.1.4-1
ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
Uname: Linux 5.8.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Wed Sep 16 11:50:50 2020
InstallationDate: Installed on 2020-09-16 (0 days ago)
InstallationMedia: Ubuntu-MATE 20.10 "Groovy Gorilla" - Alpha amd64 (20200916)
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: arctica-greeter
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1895875

[Bill (franksmcb) (franksmcb)]

Commenting out: greeter-show-manual-login=true in /etc/lightdm/lightdm.conf.d/90-arctica-greeter.conf

Appears to return the previous login characteristics of Ubuntu MATE.

[Norbert (nrbrtx)]

Bug still exists in latest UM 20201017 ISO.

Reported upstream as https://github.com/ArcticaProject/arctica-greeter/issues/16 to inform @sunweaver directly.

[Sai Vinoba (saivinoba)]

Bug exists with UM 20201020 ISO.

[Sai Vinoba (saivinoba)]

I can confirm commenting out manual login as suggested in comment 5 (https://bugs.launchpad.net/ubuntu/+source/arctica-greeter/+bug/1895875/comments/5) makes created user to be highlighted.