I would very much like to run Okular 1.3 on my Kubuntu 16.04 installation, rather than the old version that comes with 16.04. However, I have not been able to find any backports, and only version 1.0 available as a snap.
Is there any PPA somewhere, or some other way of finding snaps, that might make it possible to run Okular 1.3 under Kubuntu 16?
You can use Flatpak (see KDE Guidelines, you will get Okular 1.4.70 from KDE Platform 18.04, which is the latest).
Install it
Add KDE repo
Install Okular
Run Okular