On a recent laptop I want to read out loud a long text document.
Okular is 1.4.2
KDE Neon is 5.13 with Qt 5.11 and based on Ubuntu 16.04 LTS.
I had installed Jovie and Kmouth before with no luck.
It's still silent.
Is there more I can do now? (upgrade Neon to an unstable version, tweak something?)
Or should I wait for the next Neon release based on 18.04 LTS?

In google searches I found a post by tosky saying jovie was obsolete...
viewtopic.php?f=251&t=143500

Hi pwrcurl,
I do not thing so, I have just tried this commands on my desktop pc.
pkcon search jovie
Buscando por detalles [=========================]
Cargando caché [=========================]
Consultando [=========================]
Finalizado [=========================]
Disponible jovie-4:15.12.3-0ubuntu1.amd64 (ubuntu-xenial-universe) text-to-speech system
Disponible jovie-4:15.12.3-0ubuntu1.i386 (ubuntu-xenial-universe) text-to-speech system
Disponible jovie-dbg-4:15.12.3-0ubuntu1.amd64 (ubuntu-xenial-universe) debugging symbols for jovie
Disponible jovie-dbg-4:15.12.3-0ubuntu1.i386 (ubuntu-xenial-universe) debugging symbols for jovie
Disponible kttsd-4:15.12.3-0ubuntu1.all (ubuntu-xenial-universe) transitional package for jovie
jochoa@jochoapc:~$ pkcon search kmouth
Buscando por detalles [=========================]
Cargando caché [=========================]
Consultando [=========================]
Finalizado [=========================]
Disponible kmouth-4:15.12.3-0ubuntu1.i386 (ubuntu-xenial-universe) type-and-say frontend for speech synthesizers
Disponible kmouth-4:18.04.3-0xneon+16.04+xenial+build12.amd64 (neon-xenial-main) type-and-say frontend for speech synthesizers
Disponible kmouth-dbg-4:15.12.3-0ubuntu1.amd64 (ubuntu-xenial-universe) debugging symbols for kmouth
Disponible kmouth-dbg-4:15.12.3-0ubuntu1.i386 (ubuntu-xenial-universe) debugging symbols for kmouth
Disponible kmouth-dbgsym-4:18.04.3-0xneon+16.04+xenial+build12.amd64 (neon-xenial-main) Debug symbols for kmouth

I do not know whether kubuntu comes with PackageEdit package manager pkcon.

Although you can use apt search, or maybe, apt remove --purge and install it again with fresh dependencies.

Hope it help you.