--force-yes
Force yes; this is a dangerous option that will cause apt to continue
without prompting if it is doing something potentially harmful. It should
not be used except in very special situations. Using force-yes can
potentially destroy your system! Configuration Item: APT::Get::force-yes.
This is deprecated and replaced by --allow-downgrades, --allow-remove-
essential, --allow-change-held-packages in 1.1.
From Raspbian version Stretch there is a warning:
See also: manpages.debian.org/stretch/apt/apt-get.8.en.html