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.
Install Orca
To start Orca using the keyboard:
Press Super+Alt+S.
Or to start Orca using a mouse and keyboard:
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.
Quickly turn Screen Reader on and off
You can turn Screen Reader on and off by clicking the
accessibility icon in the top bar and
selecting Screen Reader.