Enable xenial-updates repo

Closes-Bug: PROD-35214
Change-Id: I37d9d1d52d61096ae700bb0230c75738cbbae0c0
diff --git a/linux/system/repo/mcp/apt_mirantis/update/ubuntu.yml b/linux/system/repo/mcp/apt_mirantis/update/ubuntu.yml
index 6635d9b..a345feb 100644
--- a/linux/system/repo/mcp/apt_mirantis/update/ubuntu.yml
+++ b/linux/system/repo/mcp/apt_mirantis/update/ubuntu.yml
@@ -7,11 +7,11 @@
 #          source: "deb [arch=amd64] ${_param:linux_system_repo_update_ubuntu_url} ${_param:linux_system_codename} main restricted universe"
 #          architectures: ${_param:linux_system_architecture}
 #          default: true
-#        ubuntu_updates_update:
-#          refresh_db: ${_param:linux_repo_refresh_db}
-#          source: "deb [arch=amd64] ${_param:linux_system_repo_update_ubuntu_url} ${_param:linux_system_codename}-updates main restricted universe"
-#          architectures: ${_param:linux_system_architecture}
-#          default: true
+        ubuntu_updates_update:
+          refresh_db: ${_param:linux_repo_refresh_db}
+          source: "deb [arch=amd64] ${_param:linux_system_repo_update_ubuntu_url} ${_param:linux_system_codename}-updates main restricted universe"
+          architectures: ${_param:linux_system_architecture}
+          default: true
         ubuntu_security_update:
           refresh_db: ${_param:linux_repo_refresh_db}
           source: "deb [arch=amd64] ${_param:linux_system_repo_update_ubuntu_url} ${_param:linux_system_codename}-security main restricted universe"