Bearing in mind that the error mentioned in this bug is not directly associated with rdiff-backup and is resolved by reinstalling the python-support package, we terminate this bug and proceed to close it.
Thank you very much Jeff for all the information provided -- ⢀⣴⠾⠻⢶⣦⠀ Pablo Mestre Drake ⣾⠁⢠⠒⠀⣿⡁ -------------------------------------- ⢿⡄⠘⠷⠚⠋ https://debian.org ⠈⠳⣄⠀⠀⠀⠀ Debian, the universal operating system.