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Duplicity v2.1.0 backups are failing with the error: "... --gpg-options expected one argument". The issue is that duplicity v2.1.0 began using the argparse Python library and the parse_known_args function. This function interprets the argument being passed, "--cipher-algo=AES256", as an argument name (because of the leading '-') and not as an argument value. Because of that it exits with an error and reports that the --gpg-options arg is missing its value. Adding an extra set of quotes around this string causes parse_known_args to interpret the string as an argument value.