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-rw-r--r--tests/docker/dockerfiles/ubuntu.docker3
1 files changed, 2 insertions, 1 deletions
diff --git a/tests/docker/dockerfiles/ubuntu.docker b/tests/docker/dockerfiles/ubuntu.docker
index d3b72209c8..a4f601395c 100644
--- a/tests/docker/dockerfiles/ubuntu.docker
+++ b/tests/docker/dockerfiles/ubuntu.docker
@@ -61,10 +61,11 @@ ENV PACKAGES flex bison \
     libxen-dev \
     make \
     python-yaml \
+    python3-sphinx \
     sparse \
     texinfo \
     xfslibs-dev
 RUN apt-get update && \
-    apt-get -y install $PACKAGES
+    DEBIAN_FRONTEND=noninteractive apt-get -y install $PACKAGES
 RUN dpkg -l $PACKAGES | sort > /packages.txt
 ENV FEATURES clang pyyaml sdl2