Interop matrix docker builds are failing due to amd64 pkgs not found. Here is the log:

Step 8/10 : RUN apt-get update && apt-get -y install libgflags-dev libgtest-dev libc++-dev clang && apt-get clean
---> Running in 44689cac932b
Ign http://deb.debian.org jessie InRelease
Ign http://deb.debian.org jessie-updates InRelease
Get:1 http://security.debian.org jessie/updates InRelease [44.9 kB]
Hit http://deb.debian.org jessie Release.gpg
Get:2 http://security.debian.org jessie/updates/main amd64 Packages [825 kB]
Ign http://deb.debian.org jessie-updates Release.gpg
Hit http://deb.debian.org jessie Release
Ign http://deb.debian.org jessie-updates Release
Get:3 http://deb.debian.org jessie/main amd64 Packages [9098 kB]
Err http://deb.debian.org jessie-updates/main amd64 Packages

Err http://deb.debian.org jessie-updates/main amd64 Packages

Err http://deb.debian.org jessie-updates/main amd64 Packages

Err http://deb.debian.org jessie-updates/main amd64 Packages

Err http://deb.debian.org jessie-updates/main amd64 Packages
404 Not Found
W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.
Fetched 9968 kB in 31s (314 kB/s)
Removing intermediate container 44689cac932b
The command '/bin/sh -c apt-get update && apt-get -y install libgflags-dev libgtest-dev libc++-dev clang && apt-get clean' returned a non-zero code: 100

• exit 100
  FAILED: build_docker_cxx [ret=100, pid=152895, time=46.9sec]
  FAILED: Failed to build interop docker images.