pitivi 설치 후 실행할 때 메시지?

pitivi 를 우분투에 설치 했습니다. 실행은 되는데 아래와 같은 메시지가 나와서... 왜 그런지? 어떻게 하면 되는지? 궁금합니다.

Missing soft dependency: - pycanberra not found on the system

-> enables sound notifications when rendering is complete

Missing soft dependency: - GnomeDesktop not found on the system

-> file thumbnails provided by GNOME's thumbnailers

Missing soft dependency: - Notify not found on the system

-> enables visual notifications when rendering is complete