Ubuntu MATE 20.10 arctica-greeter requires seleting user on first boot

[N0rbert]

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.

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DistroRelease: Ubuntu 20.10 (installed from 20201017 ISO) Package: arctica-greeter 0.99.1.4-1 Downstream bug-report: https://pad.lv/1895875 .

[saivinoba]

Still exists in 21.04 daily build ISOs (tested on Ubuntu MATE 20210223 ISO).