diff --git a/mender-convert-modify b/mender-convert-modify
index 0017c10..7fb2446 100755
--- a/mender-convert-modify
+++ b/mender-convert-modify
@@ -120,7 +120,7 @@ if [ "${MENDER_GRUB_EFI_INTEGRATION}" == "y" ]; then
   if [ -z "${MENDER_GRUB_INITRD_IMAGETYPE}" ]; then
     initrd_imagetype=$(probe_initrd_in_boot_and_root)
   else
-    kernel_imagetype="${MENDER_GRUB_INITRD_IMAGETYPE}"
+    initrd_imagetype="${MENDER_GRUB_INITRD_IMAGETYPE}"
   fi
 
   cat <<- EOF > work/grub-mender-grubenv-${MENDER_GRUBENV_VERSION}/mender_grubenv_defines
diff --git a/mender-convert-package b/mender-convert-package
index 025394b..0098497 100755
--- a/mender-convert-package
+++ b/mender-convert-package
@@ -23,8 +23,8 @@ PLATFORM_PACKAGE_HOOKS=(platform_package)
 
 function trap_exit() {
   echo "mender-convert-package has finished. Cleaning up..."
-  sudo umount -f work/boot > /dev/null
-  sudo umount -f work/rootfs > /dev/null
+  sudo umount -f work/boot > /dev/null 2>&1 || true
+  sudo umount -f work/rootfs > /dev/null 2>&1 || true
 }
 
 function trap_term() {
@@ -255,6 +255,10 @@ if [ "${MENDER_COPY_BOOT_GAP}" == "y" ]; then
   disk_write_at_offset "${output_dir}/boot-gap.bin" "${img_path}" "1"
 fi
 
+# Unmount filesystem image files
+run_and_log_cmd "sudo umount -f work/boot"
+run_and_log_cmd "sudo umount -f work/rootfs"
+
 # Burn Partitions
 log_info "Writing boot partition image"
 disk_write_at_offset "${boot_part}" "${img_path}" "${boot_part_start}"
diff --git a/modules/log.sh b/modules/log.sh
index e22c577..271fc4d 100644
--- a/modules/log.sh
+++ b/modules/log.sh
@@ -32,7 +32,8 @@ function log {
   local -r message="$2"
   local -r timestamp=$(date +"%Y-%m-%d %H:%M:%S")
   local -r script_name="$(basename "$0")"
-  >&2 echo -e "${timestamp} [${level}] [$script_name] ${message}" | tee -a ${log_file}
+  echo -e "${timestamp} [${level}] [$script_name] ${message}" >> ${log_file}
+  >&2 echo -e "${timestamp} [${level}] [$script_name] ${message}"
 }
 
 function local_log_debug {