Automate your debian installations using the preseeding method to answer install questions from a file.

Debian Stretch Preseed Manual - https://www.debian.org/releases/stretch/amd64/apb.html.en
Debian Stretch Preseed Official Example - https://www.debian.org/releases/stretch/example-preseed.txt
SysEng Quick Preseed File - http://syseng.technoplaza.net/files/stretch-preseed.txt