import re


def check_package_name(pkg):
    """Check the package name against Debian Policy:
    https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Source

    Returns True if the package name is valid."""

    pkg_re = re.compile('^[a-z0-9][a-z0-9+-\.]+$')

    return True if pkg_re.match(pkg) else False