Twin Update

Twin Update allows users to close, update, and verify the same apt-packaged desktop applications on two Debian/Ubuntu-family Linux machines simultaneously with a verified one-command rollback feature. It performs synchronized updates via SSH, ensuring apps are gracefully closed and updated only if matching versions are available on both machines. Rollback copies of installed packages are maintained for verified restoration if needed. It manages updates exclusively for apt-packaged desktop apps, excluding snaps, flatpaks, and app images.