Linux Capable published a tutorial about installing or upgrading GNOME Subtitles on Ubuntu 20.04 LTS.

Install/Upgrade GNOME Subtitles on Ubuntu 20.04 LTS

GNOME Subtitles is an easy-to-use subtitle editor for Linux. It allows you to add subtitles and captions with preview, timing synchronization capabilities

Install/Upgrade GNOME Subtitles on Ubuntu 20.04 LTS - LinuxCapable