Unixcop published a tutorial about installing GNOME Subtitles on Ubuntu 20.04 or 22.04 LTS.

How To Install GNOME Subtitles on Ubuntu 20.04 | 22.04 LTS

In this guide, we will show you how to install Gnome Subtitles on Ubuntu Systems. Gnome Subtitles is an open-source subtitle editor for the GNOME desktop, based on Mono. It supports the most common text-based subtitle formats, video previewing, timings synchronization and subtitle translation. Gnome Subtitles is free software released under the GNU General Public License. 

How To Install GNOME Subtitles on Ubuntu 20.04 | 22.04 LTS - Unix / Linux the admins Tutorials