I experienced this issue in a Docker container, hanging at this point:
Step 5/24 : RUN apt-get update && apt-get install -y --no-install-recommends cuda-cudart-$CUDA_PKG_VERSION cuda-compat-10-1 && ln -s cuda-10.1 /usr/local/cuda && rm -rf /var/lib/apt/lists/*
---> Running in 3cb10279744e
Ign:1 http://deb.debian.org/debian stretch InRelease
Get:2 http://security.debian.org/debian-security stretch/updates InRelease [94.3 kB]
Get:3 http://deb.debian.org/debian stretch-updates InRelease [91.0 kB]
Get:4 http://deb.debian.org/debian stretch Release [118 kB]
Get:5 http://deb.debian.org/debian stretch Release.gpg [2434 B]
Get:6 http://deb.debian.org/debian stretch-updates/main amd64 Packages [11.1 kB]
Get:7 http://security.debian.org/debian-security stretch/updates/main amd64 Packages [485 kB]
Get:8 http://deb.debian.org/debian stretch/main amd64 Packages [7084 kB]
Strace showed it waiting on data from a socket:
$ ps -faux|less|grep docker-compose
testuser 8098 0.4 0.4 115644 39016 pts/0 S+ 08:56 0:00 | \_ /usr/bin/python3 /usr/local/bin/docker-compose build app
testuser 8402 0.0 0.0 13136 1084 pts/1 S+ 08:59 0:00 \_ grep docker-compose
$ sudo strace -fp 8098
strace: Process 8098 attached
recvfrom(6,
I narrowed down the issue to a https apt sources.list entry I had added and the fix was to install the following packages before that sources update:
apt-get install -y --no-install-recommends gnupg2 curl ca-certificates apt-transport-https
Thanks