Live Captions is a free and open source live captioning software for Linux. It caption all your desktop mic audio locally. Just run it and play your audio in your desktop and it automatically caption in real-time without any data collection and telemetry. Currently it only supports English language. You can adjust font, font size, and toggle uppercase lowercase and more.
How to Install Live Captions on Ubuntu Linux
Live Captions is available as a flatpak package file from remote flathub. You need to install the flatpak and flathub on your Linux system and restart it after the installation. Follow the below link for the flatpak and flathub installation instructions.
Install flatpak and flathub on Ubuntu Linux
Now open the terminal software using ctrl+alt+t keys and run below Live Captions software flatpak install command.
flatpak install flathub net.sapples.LiveCaptions
Open the Live Captions app using
flatpak run net.sapples.LiveCaptions
And uninstall Live Captions app using below command.
sudo flatpak uninstall net.sapples.LiveCaptions