Package: debian-installer-utils Version: 1.144 Booting with preseed/url=https://example.org/preseed.cfg fails if the system's clock is awfully wrong. I've got a system convinved that today is January 1st, 1970 and unsurprisingly the wget certificate check fails. Also unsurprisingly adding debian-installer/allow_unauthenticated_ssl=true is a viable workaround.
Given that AFAIK d-i does support setting the date with ntp, it may possibly make sense to do that before wgetting the preseed file? Thanks, Emanuele