GitHub user RosiKyu added a comment to the discussion: Ubuntu 20.04 Template 
Problem

I tried deploying your template and got "Operating System not found" - it won't 
boot at all. 

Can you confirm:
1. Does your template use BIOS or UEFI firmware?
2. What disk controller?

In my test, the deployment had vmdk errors during first power-on attempts, and 
the VM eventually powered on but can't find the OS.

<img width="1494" height="812" alt="image" 
src="https://github.com/user-attachments/assets/9cc7eb5c-3103-408a-ac53-39462950ed0a";
 />

<img width="1434" height="840" alt="image" 
src="https://github.com/user-attachments/assets/3ac8f365-f6ae-4c02-99ff-a99d9548abd0";
 />

<img width="1434" height="840" alt="image" 
src="https://github.com/user-attachments/assets/a99a418a-7f91-41f4-af1e-12bc06ee2870";
 />

I have **also tested with the official Ubuntu 20.04 cloud image**: 
https://cloud-images.ubuntu.com/focal/current/focal-server-cloudimg-amd64.ova

First deployment on ESXi 8.0.3 - boots cleanly, NO EXT4 errors.

Can you test this same image on your ESXi 8.0.3 cluster? This will help 
determine if the issue is template-specific or environment-specific.

<img width="3111" height="1570" alt="Screenshot from 2026-02-09 21-54-57" 
src="https://github.com/user-attachments/assets/08df9af2-572e-41b9-ad96-b89cc36d70c5";
 />

<img width="3111" height="1570" alt="Screenshot from 2026-02-09 21-55-13" 
src="https://github.com/user-attachments/assets/ca470723-0578-4794-a641-4b5abe5145a5";
 />

<img width="3111" height="1570" alt="Screenshot from 2026-02-09 21-55-32" 
src="https://github.com/user-attachments/assets/d5ee3746-65aa-48ac-bc78-eb531daf0438";
 />

<img width="3111" height="1570" alt="Screenshot from 2026-02-09 21-55-35" 
src="https://github.com/user-attachments/assets/c7fba819-5f56-43d3-9a46-e444691f464e";
 />

GitHub link: 
https://github.com/apache/cloudstack/discussions/12610#discussioncomment-15748077

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