diff --git a/core/start-service.sh b/core/start-service.sh
index a46e252..3d8c25f 100755
--- a/core/start-service.sh
+++ b/core/start-service.sh
@@ -16,7 +16,7 @@ ADDITIONAL_KOPANO_PACKAGES=$(echo "$ADDITIONAL_KOPANO_PACKAGES" | tr -d '"')
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes --no-upgrade install "$installpkg"
+		DEBIAN_FRONTEND=noninteractive apt --assume-yes --no-upgrade install "$installpkg"
 	else
 		echo "INFO: $installpkg is already installed"
 	fi
diff --git a/webapp/start.sh b/webapp/start.sh
index d86dda0..c14b05e 100755
--- a/webapp/start.sh
+++ b/webapp/start.sh
@@ -19,7 +19,7 @@ ADDITIONAL_KOPANO_PACKAGES=$(echo "$ADDITIONAL_KOPANO_PACKAGES" | tr -d '"')
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes --no-upgrade install "$installpkg"
+		DEBIAN_FRONTEND=noninteractive apt --assume-yes --no-upgrade install "$installpkg"
 	else
 		echo "INFO: $installpkg is already installed"
 	fi
diff --git a/zpush/start.sh b/zpush/start.sh
index 91ce6ad..a7b24f8 100755
--- a/zpush/start.sh
+++ b/zpush/start.sh
@@ -44,7 +44,7 @@ ADDITIONAL_KOPANO_PACKAGES=$(echo "$ADDITIONAL_KOPANO_PACKAGES" | tr -d '"')
 [ -n "${ADDITIONAL_KOPANO_PACKAGES// }" ] && for installpkg in $ADDITIONAL_KOPANO_PACKAGES; do
 	# shellcheck disable=SC2016 disable=SC2086
 	if [ "$(dpkg-query -W -f='${Status}' $installpkg 2>/dev/null | grep -c 'ok installed')" -eq 0 ]; then
-		apt --assume-yes --no-upgrade install "$installpkg"
+		DEBIAN_FRONTEND=noninteractive apt --assume-yes --no-upgrade install "$installpkg"
 	else
 		echo "INFO: $installpkg is already installed"
 	fi