"eject media and press return to reboot" is not read out
Binary package hint: ubiquity
after completing the screen reader install you are prompted to restart. Then the GUI shuts down and on the console there is a silent message telling you to eject the installation media and press return to reboot. The screen reader install should tell you this before the screen reader shuts down. e.g. "Ubuntu will now shut down. When the disk activity ends, eject any installation media such as a CD and press return to reboot"