diff -Nru nullboot-0.4.0/debian/changelog nullboot-0.4.0/debian/changelog
--- nullboot-0.4.0/debian/changelog	2022-05-18 16:09:13.000000000 +0200
+++ nullboot-0.4.0/debian/changelog	2022-10-18 09:12:00.000000000 +0200
@@ -1,3 +1,10 @@
+nullboot (0.4.0-0ubuntu1~ppa1) kinetic; urgency=medium
+
+  * To allow installation on systems with no TPM, run nullbootctl with
+    --no-tpm --no-efivars during postinstall if no TPM is found.
+
+ -- Gauthier Jolly <gauthier.jolly@canonical.com>  Tue, 18 Oct 2022 09:12:00 +0200
+
 nullboot (0.4.0-0ubuntu1) kinetic; urgency=medium
 
   * Feature:
diff -Nru nullboot-0.4.0/debian/nullboot.postinst nullboot-0.4.0/debian/nullboot.postinst
--- nullboot-0.4.0/debian/nullboot.postinst	2022-05-18 16:09:13.000000000 +0200
+++ nullboot-0.4.0/debian/nullboot.postinst	2022-10-18 09:01:39.000000000 +0200
@@ -1,8 +1,14 @@
 #!/bin/sh
 set -e
 if [ "$1" = "triggered" ] || [ "$1" = "configure" ]; then
-    if [ -e "/boot/efi/EFI/ubuntu/" ]; then
+    # check if ESP is mounted and a TPM is available on the system
+    if [ -e "/boot/efi/EFI/ubuntu/" ] && [ -e "/dev/tpm0" ]; then
+        # if so, run nullbootctl to insert EFI variables and re-seal
+        # the secret
         nullbootctl
+    else
+        # Otherwise, still run nullboot but only configure BOOTX64.CSV
+        nullbootctl --no-tpm --no-efivars
     fi
 fi