Add explicit detection of SSL/certificate errors when running apt-get update and treat those mirrors as failed (logs a short SSL error snippet and returns failure). Change mirror URL rewrites to use http:// instead of https:// when substituting mirror hosts, and remove ftp.in.debian.org from the AP mirror lists. Changes applied to misc/build.func (try_mirrors) and misc/install.func (pkg_update/_try_apt_mirror) to improve mirror fallback behavior and error reporting.
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