Comment 3 for bug 1769224

In my case, the two layouts are correctly available for choice. So that part is OK.

Indeed as per the comment you quote :
It may be motivated to ask upstream why they don't make use of the information provided by accountsservice in the same way as unity-greeter does.

When this happens with bugs#1766137, it makes 18.04 not usable for a family computer. (error on the password leading to a blank screen).