diff -Nru mdadm-4.2/debian/changelog mdadm-4.2/debian/changelog
--- mdadm-4.2/debian/changelog	2022-02-24 23:19:00.000000000 +0800
+++ mdadm-4.2/debian/changelog	2022-10-24 13:33:40.000000000 +0800
@@ -1,3 +1,9 @@
+mdadm (4.2-0ubuntu2) jammy; urgency=medium
+
+  * Mount efivarfs. (LP: #1993541) 
+
+ -- Cyrus Lien <cyrus.lien@canonical.com>  Mon, 24 Oct 2022 13:33:40 +0800
+
 mdadm (4.2-0ubuntu1) jammy; urgency=medium
 
   * New upstream release (LP: #1959843)
diff -Nru mdadm-4.2/debian/initramfs/00_mount_efivarfs mdadm-4.2/debian/initramfs/00_mount_efivarfs
--- mdadm-4.2/debian/initramfs/00_mount_efivarfs	1970-01-01 08:00:00.000000000 +0800
+++ mdadm-4.2/debian/initramfs/00_mount_efivarfs	2022-10-24 13:33:40.000000000 +0800
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+PREREQ=""
+prereqs()
+{
+ echo "$PREREQ"
+}
+case $1 in
+# get pre-requisites
+prereqs)
+ prereqs
+ exit 0
+ ;;
+esac
+
+# shellcheck disable=SC2013
+if [ -d /sys/firmware/efi/efivars ]; then
+	mount -t efivarfs efivarfs /sys/firmware/efi/efivars
+fi
diff -Nru mdadm-4.2/debian/rules mdadm-4.2/debian/rules
--- mdadm-4.2/debian/rules	2021-05-11 21:49:35.000000000 +0800
+++ mdadm-4.2/debian/rules	2022-10-24 13:33:40.000000000 +0800
@@ -58,6 +58,8 @@
 		$(DESTDIR)/usr/share/initramfs-tools/scripts/local-block/mdadm
 	install -Dm0755 debian/initramfs/script.local-bottom \
 		$(DESTDIR)/usr/share/initramfs-tools/scripts/local-bottom/mdadm
+	install -Dm0755 debian/initramfs/00_mount_efivarfs \
+		$(DESTDIR)/usr/share/initramfs-tools/scripts/init-top/00_mount_efivarfs
 	install -Dm0644 debian/mdadm.modules \
 		$(DESTDIR)/etc/modprobe.d/mdadm.conf
 	install -Dm0755 debian/mdadm.finalrd \