My wife has been using Thunderbird for years. Version 68.x.x is the last version available in the official Ubuntu repo, it was added in August.
TB 78 for Ubuntu seems to exist as Flatpak or Snap exclusively. I tried those on my computer but they have some drawbacks (lacking support for third party apps if one tries to open attachments, complicated update of the flatpak version) which are showstoppers.
Does anyone know a trustable repo for TB 78+? Is Ubuntu planning to add TB 78 to their official repos whatsoever?