-Specifies whether to authenticate packages from this release, even if the Release file is not signed or the signature can't be checked.
-Unlike the `allow_unsigned` (trusted=yes) option, this should throw a warning that the interaction is insecure.
-See [this comment](https://unix.stackexchange.com/a/480550) for a brief discussion of the difference and why this option might be preferable to `allow_unsigned`.