For more information about the ungoogled-chromium flatpak, please check the official repository on GitHub.
This package was previously com.github.Eloston.UngoogledChromium,
but was renamed to io.github.ungoogled_software.ungoogled_chromium.
If you are using the old package, you will be promoted to move to the
new package when doing a flatpak update. Your files will be
migrated automatically, so you won't lose any browser data, but you might need to migrate your flatpak overrides manually if you have any.
The reason for the migration was to reflect the move of the project from Eloston's personal GitHub account to the ungoogled-software organization and to verify the flatpak.