GNOME provides the Orca screen reader to speak the user interface. Depending on how you installed GNOME, you might not have Orca installed. If not, install Orca first.
Open the Activities overview and start typing Universal Access.
Click Universal Access to open the panel.
Click Screen Reader in the Seeing section, then switch Screen Reader on in the dialog.
You can turn Screen Reader on and off by clicking the accessibility icon in the top bar and selecting Screen Reader.
Refer to the Orca Help for more information.
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