FROM ubuntu:disco
RUN dpkg --add-architecture armhf && apt-get update
generates the following error:
Get:1 http://archive.ubuntu.com/ubuntu disco InRelease [243 kB]
Get:2 http://security.ubuntu.com/ubuntu disco-security InRelease [65.4 kB]
Get:3 http://archive.ubuntu.com/ubuntu disco-updates InRelease [65.4 kB]
Get:4 http://archive.ubuntu.com/ubuntu disco-backports InRelease [65.5 kB]
Get:5 http://archive.ubuntu.com/ubuntu disco/multiverse amd64 Packages [197 kB]
Get:6 http://archive.ubuntu.com/ubuntu disco/restricted amd64 Packages [14.6 kB]
Ign:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Get:9 http://archive.ubuntu.com/ubuntu disco/universe amd64 Packages [11.9 MB]
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Get:12 http://archive.ubuntu.com/ubuntu disco/main amd64 Packages [1332 kB]
Ign:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Ign:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Ign:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Ign:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Err:7 http://archive.ubuntu.com/ubuntu disco/main armhf Packages
404 Not Found [IP: 91.189.88.162 80]
Ign:8 http://archive.ubuntu.com/ubuntu disco/universe armhf Packages
Ign:10 http://archive.ubuntu.com/ubuntu disco/restricted armhf Packages
Ign:11 http://archive.ubuntu.com/ubuntu disco/multiverse armhf Packages
Fetched 13.9 MB in 3s (4794 kB/s)
Reading package lists...
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/disco/main/binary-armhf/Packages 404 Not Found [IP: 91.189.88.162 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
The working workaround is to add ports.ubuntu.com to apt sources:
FROM ubuntu:disco
RUN dpkg --add-architecture armhf && \
sed -r 's#(deb(-src)?)( http://([a-z]{2}.)?archive.)#\1 [arch=i386,amd64]\3#' -i.bak /etc/apt/sources.list && \
echo 'deb [arch=armhf] http://ports.ubuntu.com/ disco main restricted universe multiverse' >> /etc/apt/sources.list && \
apt-get update
Get:1 http://archive.ubuntu.com/ubuntu disco InRelease [243 kB]
Get:2 http://security.ubuntu.com/ubuntu disco-security InRelease [65.4 kB]
Get:3 http://ports.ubuntu.com disco InRelease [243 kB]
Get:4 http://archive.ubuntu.com/ubuntu disco-updates InRelease [65.4 kB]
Get:5 http://ports.ubuntu.com disco/restricted armhf Packages [12.5 kB]
Get:6 http://archive.ubuntu.com/ubuntu disco-backports InRelease [65.5 kB]
Get:7 http://ports.ubuntu.com disco/main armhf Packages [1270 kB]
Get:8 http://archive.ubuntu.com/ubuntu disco/main i386 Packages [1316 kB]
Get:9 http://ports.ubuntu.com disco/universe armhf Packages [11.5 MB]
Get:10 http://archive.ubuntu.com/ubuntu disco/main amd64 Packages [1332 kB]
Get:11 http://archive.ubuntu.com/ubuntu disco/multiverse i386 Packages [181 kB]
Get:12 http://archive.ubuntu.com/ubuntu disco/universe i386 Packages [11.9 MB]
Get:13 http://ports.ubuntu.com disco/multiverse armhf Packages [155 kB]
Get:14 http://archive.ubuntu.com/ubuntu disco/universe amd64 Packages [11.9 MB]
Get:15 http://archive.ubuntu.com/ubuntu disco/restricted amd64 Packages [14.6 kB]
Get:16 http://archive.ubuntu.com/ubuntu disco/restricted i386 Packages [14.1 kB]
Get:17 http://archive.ubuntu.com/ubuntu disco/multiverse amd64 Packages [197 kB]
Fetched 40.5 MB in 5s (8474 kB/s)
Please fix /etc/apt/sources.list in docker ubuntu:disco image
