diff --git a/scripts/install/deb.sh b/scripts/install/deb.sh
index 0fea92980..57fc262c0 100644
--- a/scripts/install/deb.sh
+++ b/scripts/install/deb.sh
@@ -18,18 +18,19 @@ dependencies="nginx maven mysql-server openjdk-8-jdk-headless acl procps curl se
 export DEBIAN_FRONTEND=noninteractive
 INSTALLED_TOMCAT=N
 INSTALLED_MYSQLPYCON=N
+APT_GET='apt-get -y -qq -o=Dpkg::Use-Pty=0'
 
-sudo apt-get -y update
+sudo ${APT_GET} update
 
 if ! apt-cache -qq show openjdk-8-jdk-headless > /dev/null; then
   echo "==== Adding openjdk-8 repo ===="
   if [ "${FCW_INSTALL_VND}" = Ubuntu ]; then
-    sudo apt-get -y install --no-install-recommends python3-software-properties software-properties-common
+    sudo ${APT_GET} install --no-install-recommends python3-software-properties software-properties-common
     sudo add-apt-repository -y ppa:openjdk-r/ppa
   else
     echo "deb http://http.debian.net/debian ${FCW_INSTALL_REL}-backports main" | sudo tee --append /etc/apt/sources.list.d/${FCW_INSTALL_REL}-backports.list > /dev/null
   fi
-  sudo apt-get -y update
+  sudo ${APT_GET} update
 fi
 
 if apt-cache -qq show tomcat8 > /dev/null; then
@@ -59,12 +60,12 @@ done
 
 echo "==== Installing Updates and Dependencies ===="
 echo "apt-get upgrade"
-sudo apt-get -y upgrade
+sudo ${APT_GET} upgrade
 echo "mysql setup..."
 sudo debconf-set-selections <<< "mysql-server mysql-server/root_password password ${DB_ROOT_PASSWORD}"
 sudo debconf-set-selections <<< "mysql-server mysql-server/root_password_again password ${DB_ROOT_PASSWORD}"
 echo "apt-get install dependencies"
-sudo apt-get -y install --no-install-recommends ${dependencies}
+sudo ${APT_GET} install --no-install-recommends ${dependencies}
 
 # Where default-jdk is v7, it may be installed with a higher priority than v8
 for n in java javac; do
@@ -91,7 +92,7 @@ echo "==== Installing Node.js ===="
 cd "${TMPINSTDIR}"
 curl -LOsS 'https://deb.nodesource.com/setup_8.x'
 sudo bash setup_8.x
-sudo apt-get -y install --no-install-recommends nodejs
+sudo ${APT_GET} install --no-install-recommends nodejs
 # Populate ~/.config with current user
 npm help > /dev/null
 
diff --git a/scripts/install/ext-install.sh b/scripts/install/ext-install.sh
index e48e4dc56..ddbc3dc83 100644
--- a/scripts/install/ext-install.sh
+++ b/scripts/install/ext-install.sh
@@ -34,7 +34,7 @@ ext_install_tomcat8 () {
   curl -LsS -o "${TMPFILE}" "${TOMCAT_URL}"
 
   cd /var/lib
-  sudo tar -xvzf "${TMPFILE}"
+  sudo tar -xzf "${TMPFILE}"
   sudo mv apache-tomcat-8.* tomcat8
   rm "${TMPFILE}"
 
@@ -64,7 +64,7 @@ ext_install_tornado () {
   (
     cd "${TMPINSTDIR}"
     curl -LOsS 'https://github.com/tornadoweb/tornado/archive/v4.5.3.tar.gz'
-    tar xvfz v4.5.3.tar.gz
+    tar -xzf v4.5.3.tar.gz
     cd tornado-4.5.3
     sudo -H python3 setup.py install
   )
diff --git a/scripts/install/install.sh b/scripts/install/install.sh
index 97387f879..dfeb93baf 100755
--- a/scripts/install/install.sh
+++ b/scripts/install/install.sh
@@ -319,7 +319,7 @@ sudo cp -R "${basedir}"/nginx /etc/
 if [ "${FCW_INSTALL_MODE}" = TEST ] && [ ! -f /etc/nginx/ssl/freeciv-web.crt ]; then
   sudo mkdir -p /etc/nginx/ssl/private
   sudo chmod 700 /etc/nginx/ssl/private
-  openssl req -x509 -newkey rsa:2048 -keyout freeciv-web.key -out freeciv-web.crt -days 3650 -nodes -subj '/CN=localhost'
+  openssl req -x509 -newkey rsa:2048 -keyout freeciv-web.key -out freeciv-web.crt -days 3650 -nodes -subj '/CN=localhost' -batch
   sudo mv freeciv-web.crt /etc/nginx/ssl/
   sudo mv freeciv-web.key /etc/nginx/ssl/private/
 fi