Ex Falso is a free and open source audio tag editor application for Linux, Windows and MacOS. It is based on Quod Libet audio application. It is written in Python using the Mutagen tagging library. It comes with full Unicode support, Fast track renumbering and you can Tag files based on their filenames with configurable formats. It is released under GNU General Public License v2.0.
Install Ex Falso on Ubuntu Linux
Ex Falso is available as a flatpak package file from remote flathub. So you need to install flatpak and flathub on your system first. Follow below link for that.
Restart your system after the above installation. Now open the terminal software (ctrl+alt+t) and run below Ex Falso flatpak installation command. It will install the latest version of Ex Falso on your system
flatpak install flathub io.github.quodlibet.ExFalso
Now open Ex Falso app using
flatpak run io.github.quodlibet.ExFalso
You can also uninstall it via
sudo flatpak uninstall io.github.quodlibet.ExFalso