diff --git a/.travis.yml b/.travis.yml
index 1977b5ec..2f3ef055 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,6 @@ env:
   - ci_docker=debian:buster-slim ci_distro=debian ci_suite=stretch ci_configopts="--with-ed25519-libsodium" ci_pkgs="libsodium-dev"
   - ci_docker=debian:buster-slim ci_distro=debian ci_suite=stretch ci_configopts="--with-curl --with-ed25519-libsodium --without-gpgme" ci_pkgs="libsodium-dev"
   - ci_docker=ubuntu:focal ci_distro=ubuntu ci_suite=focal
-  - ci_docker=i386/ubuntu:focal ci_distro=ubuntu ci_suite=focal
   - ci_docker=ubuntu:groovy ci_distro=ubuntu ci_suite=groovy
 
 script:
diff --git a/ci/travis-install.sh b/ci/travis-install.sh
index 64801741..b40f4c55 100755
--- a/ci/travis-install.sh
+++ b/ci/travis-install.sh
@@ -82,6 +82,10 @@ esac
 
 case "$ci_distro" in
     (debian|ubuntu)
+        # Make debconf run non-interactively since its questions can't
+        # be answered.
+        export DEBIAN_FRONTEND=noninteractive
+
         # TODO: fetch this list from the Debian packaging git repository?
         $sudo apt-get -y update
         $sudo apt-get -y install \