diff --git a/bootstrap.sh b/bootstrap.sh
index 286ee19..4fb935b 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -21,8 +21,11 @@ LOCALES=(
     "en_US.UTF-8"
 )
 
-# APT_CMD="apt-get -qq" # -qq includes -y
-APT_CMD="apt-get -y" # -qq includes -y
+export DEBIAN_FRONTEND=noninteractive
+# Configure apt-get to run non-interactively and handle configuration files safely:
+#   --force-confdef : automatically select the default action for modified configuration files
+#   --force-confold : keep existing configuration files when a conflict is detected
+APT_CMD="apt-get -y -o Dpkg::Options::=--force-confdef -o Dpkg::Options::=--force-confold"
 APT_INSTALL="${APT_CMD} install"
 
 USR_BIN_DIR=/usr/local/bin