diff --git a/ubuntu-packer/ubuntu.pkr.hcl b/ubuntu-packer/ubuntu.pkr.hcl
index c6e3a78..251940a 100644
--- a/ubuntu-packer/ubuntu.pkr.hcl
+++ b/ubuntu-packer/ubuntu.pkr.hcl
@@ -14,7 +14,7 @@ variable "ubuntu_iso_url" {
 
 variable "ubuntu_iso_checksum" {
   type    = string
-  default = "sha256:..." # zkontroluj hash z oficiální stránky
+  default = "sha256:e5b944550b6cf926cf0a6a6c62dd8a964c57bb42e2909f26e29f03e2c0d6f1c6"
 }
 
 source "qemu" "ubuntu" {
diff --git a/ubuntu-packer/variables.pkr.hcl b/ubuntu-packer/variables.pkr.hcl
index 9375054..c35e58b 100644
--- a/ubuntu-packer/variables.pkr.hcl
+++ b/ubuntu-packer/variables.pkr.hcl
@@ -1 +1,2 @@
-ubuntu_iso_url       = "https://releases.ubuntu.com/22.04/ubuntu-22.04.4-live-server-amd64.iso"
\ No newline at end of file
+ubuntu_iso_url       = "https://releases.ubuntu.com/22.04/ubuntu-22.04.4-live-server-amd64.iso"
+ubuntu_iso_checksum = "sha256:e5b944550b6cf926cf0a6a6c62dd8a964c57bb42e2909f26e29f03e2c0d6f1c6"
\ No newline at end of file