diff --git a/images/linux/ubuntu1604.json b/images/linux/ubuntu1604.json
index 3625b7ed2..82cb0f06e 100644
--- a/images/linux/ubuntu1604.json
+++ b/images/linux/ubuntu1604.json
@@ -90,6 +90,7 @@
         },
         {
             "type": "shell",
+            "execute_command": "chmod +x {{ .Path }}; sudo {{ .Vars }} {{ .Path }}",
             "scripts":[
                 "{{template_dir}}/scripts/installers/preparemetadata.sh"
             ],
@@ -98,8 +99,7 @@
                 "METADATA_FILE={{user `metadata_file`}}",
                 "HELPER_SCRIPTS={{user `helper_script_folder`}}",
                 "ANNOUNCEMENTS={{user `announcements`}}"
-            ],
-            "execute_command": "sudo sh -c '{{ .Vars }} {{ .Path }}'"
+            ]
         },
         {
             "type": "shell",
diff --git a/images/linux/ubuntu1804.json b/images/linux/ubuntu1804.json
index b5037520d..e9c756f15 100644
--- a/images/linux/ubuntu1804.json
+++ b/images/linux/ubuntu1804.json
@@ -93,6 +93,7 @@
         },
         {
             "type": "shell",
+            "execute_command": "chmod +x {{ .Path }}; sudo {{ .Vars }} {{ .Path }}",
             "scripts":[
                 "{{template_dir}}/scripts/installers/preparemetadata.sh"
             ],
@@ -101,8 +102,7 @@
                 "METADATA_FILE={{user `metadata_file`}}",
                 "HELPER_SCRIPTS={{user `helper_script_folder`}}",
                 "ANNOUNCEMENTS={{user `announcements`}}"
-            ],
-            "execute_command": "sudo sh -c '{{ .Vars }} {{ .Path }}'"
+            ]
         },
         {
             "type": "shell",