Bug#932168: Correct version of libc-dev not found on security.debian.org

[Mobile Computing <csis0247@gmail.com>]

The error I encountered was only slightly different, instead of deb9u2, I got it on deb9u3:

Unable to correct missing packages. 

E: Failed to fetch http://security.debian.org/debian-security/pool/updates/main/l/linux/linux-libc-dev_4.9.168-1+deb9u3_amd64.deb 404 Not Found

The solution I found was to simply change "http://security.debian.org/debian-security" in sources.list to "http://deb.debian.org/debian-security". I do not understand why the URL alias failed on only this package.

RUN sed -i "s#deb http://security.debian.org/debian-security stretch/updates main#deb http://deb.debian.org/debian-security stretch/updates main#g" /etc/apt/sources.list

Thereafter I can build normally.