Install hardening stack without interactive prompts
DEBIAN_FRONTEND=noninteractive tells dpkg to skip all questions and use default answers, so the install never stalls waiting for input — the reliable form for bootstrap scripts and cloud-init user data. Add -o Dpkg::Options::="--force-confold" if you also want to protect existing config files. Combine with the retry option for flaky networks.
Looking for more? Search all 7,657 commands — works offline, in English or Spanish, and fixes typos.