Lightdm needs the slick greeter in order to work correctly with Orca. I
believe Ubuntu may be using the gtk greeter, which requires manually
editing a configuration file in order to get the screen reader talking,
unless they fixed that in Ubuntu. I know there is a long-standing
Launchpad bug for this. if alt+super+s doesn't start Orca at the lightdm
screen as expected, it is starting lightdm-gtk-greeter rather than
lightdm-slick-greeter. Perhaps the easiest way to fix this would be via
ssh, running something like
sudo apt install lightdm-slick-greeter
sudo apt remove lightdm-gtk-greeter
Hope this helps.
~Kyle
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