[Bug 2104027] Re: "Operating System Not Found" Error During Ubuntu Server 25.04 (Plucky Puffin) Installation on x86 architecture

[Frank Heimes]

Hello Himabinduy,
I am not sure if I can be of any help in this case.
The bug came in under the umbrella of the IBM Power project, but it is obviously amd64 in a VMware environment - and I am not familiar with that. But I at least try to help ...

Since plucky / 25.04 was still under heavy development 2 weeks ago there could always be a bad ISO image.
I recommend to retry with the current beta:
https://releases.ubuntu.com/25.04/
https://releases.ubuntu.com/25.04/ubuntu-25.04-beta-live-server-amd64.iso
that should have already stabilized a bit.
(and checking the hash)

Then I read that you said that the boot order is set to CD-ROM only,
but the boot messages show an PXE (netboot) attempt, which wonders me.
Probably worth to re-check the settings, and if they are persistent.

The plucky / 25.04 release already seems to work fine in many other
cases, so I think that this is not a general issue with the ISO images
themselves.

You may alternatively create a bootable USB stick and try that, booting
from USB (instead of booting the ISO as virtual CDROM).

In case you run your system under an Ubuntu subscription (Pro), it might
be worth to open an official support case (in SalesForce), our support
colleagues may have more options/environments to help in this praticular
case and on this platform (compared to me, since I work on IBM
platforms).

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https://bugs.launchpad.net/bugs/2104027

Title:
  "Operating System Not Found" Error During Ubuntu Server 25.04 (Plucky
  Puffin) Installation on x86 architecture

Status in subiquity package in Ubuntu:
  Incomplete

Bug description:
  ---Problem Description---
  Operating System Not Found" Error During Ubuntu Server 25.04 (Plucky Puffin) Installation on x86 architecture
   
  ---uname output---
  vmware version-7.0.3
    
  Machine Type = vmware version-7.0.3 
   
  ---boot type---
  CDROM / ISO image
   
  ---Install repository type---
  CDROM
   
  ---Point of failure---
  Failed during boot of installer

  Steps to Reproduce:
  1. Create a virtual machine x86 system.
  2. Attach the Ubuntu Server 25.04 (AMD64) ISO as the installation medium.
  3. then boot for installation(start the Lpar)
  The system fails to boot and displays:
  PXE-E51: No DHCP or proxyDHCP offers were received.
  PXE-M0F: Exiting Intel PXE ROM.
  Operating System not found.

  1. Did this installation work with prior 25.04 builds or other
  versions of Ubuntu?

  ans: Yes, it has been working with all versions up to 24.10.

  2. Is the boot order set to boot to the virtual cdrom or the USB
  flashdrive the ISO was written to?

  Yes, the boot order is set to boot from the CD-ROM only.

  Please check the attached screenshot of BIOS setup

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