>[оверквотинг удален]
> Password:
> polkit-agent-helper-1: pam_authenticate failed: authentication error
> (process:1330): GLib-WARNING **: GChildWatchSource: Exit status of a child process was
> requested but ECHILD was received by waitpid(
> ). Most likely the process is ignoring SIGCHLD, or some other thread
> is invoking waitpid() with a nonpositive first argument; either
>  behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly
> or indirectly.
> ==== AUTHENTICATION FAILED ===
> Error executing command as another user: Not authorized

попробуйте ввести пароль юзера, от которого запускаете ("Charlie & (root)"?), не рута.
ща попробую на свежий virtualbox накатить и проверить ещё раз