Comment 8 for bug 568704

So far it is still unfixed in debian stretch. So I just want to add more workarounds especially for using wget in the late_command section:
in-target wget --no-proxy -O /tmp/bootstrap-salt.sh https://bootstrap.saltstack.com; \
in-target /bin/sh /tmp/bootstrap-salt.sh; \
I have this from a github repo of a working preseed file: https://gist.github.com/eldondev/33366c2842df9d1b4a0e
Another option could be if someone is using in-target for wget:
in-target unset http_proxy; \
in-target wget -O /tmp/bootstrap-salt.sh https://bootstrap.saltstack.com; \
in-target /bin/sh /tmp/bootstrap-salt.sh; \