Comment 3 for bug 1545516

I've performed thesuggested quick test and yes Orca came up talking after launching it from the terminal. I was able to select a language and to find the push buttons with speech feedback.
However if I chose "Try Ubuntu" screen reading stopped entirely and the system talked no more. I know that it didn't freeze because I was able to shut it down: power switch - bang sound - Enter key - shutdown.
I tried starting/restarting Orca via Alt/Super+s and by issuing the orca and orca --replace commands from the terminal (ctrl-alt-t) and also from the Run dialog (Alt+F2), but nothing worked, the system remained silent.
Interestingly the installer talked and I was able to complete the first two screens, but I quit afterwards because I was a bit reluctant to install then ...
Is it possible that screen reader accessibility is not enabled on the Mate desktop that the live image brings up after activating the "Try Ubuntu" button?
Should I file a separate bug for this?