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diff --git a/buster/setup_scripts/purge_nonrequireds.sh b/buster/setup_scripts/purge_nonrequireds.sh
new file mode 100755
index 0000000..7a5858e
--- /dev/null
+++ b/buster/setup_scripts/purge_nonrequireds.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+# This script removes all Debian packages that are not of Priority
+# "required" or not depended on by packages of priority "required"
+# or not listed in the argument-selected files of apt-mark/.
+set -e
+
+config_tree_prefix="${HOME}/config/buster"
+aptmark_dir="${config_tree_prefix}/apt-mark"
+
+dpkg-query -Wf '${Package} ${Priority}\n' | grep ' required' | sed 's/ required//' > /tmp/list_white_unsorted
+for target in "$@"; do
+    path="${aptmark_dir}/${target}"
+    cat "${path}" | while read line; do
+        if [ ! $(echo "${line}" | cut -c1) = "#" ]; then
+            echo "${line}" >> /tmp/list_white_unsorted
+        fi
+    done
+done
+sort /tmp/list_white_unsorted > /tmp/list_white
+dpkg-query -Wf '${Package}\n' > /tmp/list_all_packages
+sort /tmp/list_all_packages > /tmp/foo
+mv /tmp/foo /tmp/list_all_packages
+comm -3 /tmp/list_all_packages /tmp/list_white > /tmp/list_black
+apt-mark auto `cat /tmp/list_black`
+DEBIAN_FRONTEND=noninteractive apt-get -y --purge autoremove
+rm /tmp/list_all_packages /tmp/list_white_unsorted /tmp/list_white /tmp/list_black