diff --git a/debian/security-misc.postinst b/debian/security-misc.postinst
index c01e24e..11e808d 100644
--- a/debian/security-misc.postinst
+++ b/debian/security-misc.postinst
@@ -29,6 +29,12 @@ case "$1" in
     ;;
 esac
 
+[ -n "$DEBIAN_FRONTEND" ] || DEBIAN_FRONTEND="noninteractive"
+[ -n "$DEBIAN_PRIORITY" ] || DEBIAN_PRIORITY="critical"
+[ -n "$DEBCONF_NOWARNINGS" ] || DEBCONF_NOWARNINGS="yes"
+[ -n "$APT_LISTCHANGES_FRONTEND" ] || APT_LISTCHANGES_FRONTEND="text"
+export POLICYRCD DEBIAN_FRONTEND DEBIAN_PRIORITY DEBCONF_NOWARNINGS APT_LISTCHANGES_FRONTEND
+
 ## Jul 07 20:35:39 host sudo[16090]: PAM unable to dlopen(pam_cgfs.so): /lib/security/pam_cgfs.so: cannot open shared object file: No such file or directory
 ## Jul 07 20:35:39 host sudo[16090]: PAM adding faulty module: pam_cgfs.so
 ## --package hangs in Qubes updater since it starts whiptail for interactive dpkg configuration dialog.
diff --git a/debian/security-misc.prerm b/debian/security-misc.prerm
index e020b84..95a420a 100644
--- a/debian/security-misc.prerm
+++ b/debian/security-misc.prerm
@@ -15,6 +15,12 @@ true "
 #####################################################################
 "
 
+[ -n "$DEBIAN_FRONTEND" ] || DEBIAN_FRONTEND="noninteractive"
+[ -n "$DEBIAN_PRIORITY" ] || DEBIAN_PRIORITY="critical"
+[ -n "$DEBCONF_NOWARNINGS" ] || DEBCONF_NOWARNINGS="yes"
+[ -n "$APT_LISTCHANGES_FRONTEND" ] || APT_LISTCHANGES_FRONTEND="text"
+export POLICYRCD DEBIAN_FRONTEND DEBIAN_PRIORITY DEBCONF_NOWARNINGS APT_LISTCHANGES_FRONTEND
+
 ## pam-auth-update is usually used in postinst and prerm.
 ## Added extra space after /var to avoid lintian false positive warning.
 #grep -r -l pam-auth-update /var /lib/dpkg/info