[Bug 1826158] Re: Failed to install guestOS ubuntu-19.04-live-server-amd64.iso(GA) in ESXi with new installer subiquity 19.04.5 when create VM with NVME disk

[Joshua Powers]

Traceback is from probert, so adding the probert task.

** Also affects: probert (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  Failed to install guestOS ubuntu-19.04-live-server-amd64.iso(GA) in
  ESXi with new installer subiquity 19.04.5 when create VM with NVME
  disk

Status in probert package in Ubuntu:
  New
Status in subiquity package in Ubuntu:
  Confirmed

Bug description:
  Summary:
  ---------------------
  Failed to install guestOS ubuntu-19.04-live-server-amd64.iso(GA) in ESXi with new installer subiquity 19.04.5 when create VM with NVME disk. 

  We get continuous flash at early install stage.

  Steps to reproduce:
  1. Create VM with NVME disk and other default setting

  2. open VMRC and mount iso ubuntu-19.04-server-amd64.iso(GA image)

  3. Power on VM, The iso is recognized and it will start to install
  guestOS

  4. We get a continuous flash at early install stage.

  5. change iso to ubuntu-19.04-beta-live-server-amd64.iso(beta), and reset VM to start 
     install with beta iso (recheck the beta image, because I didn't hit this issue in previous testing)

  6. It start to install with beta iso and give message as follows
        Installer update available

        Version 19.04.5 of the installer is now available (19.04.4 is currently running)
        You can read the release notes for each version at:
           https://github.com/CanonicallLtd/subiquity/releases
        If you choose to update, the update will be downloaded and the installation will continue form here

  7. If choose the default selection "Continue without updating", we can succeed to continue to 
     install the guestOS

  8. If choose the selection "Update to new installer", After update the installer and continue to
     install from here but get a continuous flash at this moment.

  
  This issue is related to newly updated installer subiquity. 

  Expected result:
  ---------------------
  For step 4, We can pass it.
  For step 8: We can pass it.

  relative test:
  ---------------------
  1. this issue is not related with CPU type (intel/ AMD) / firmware type (bios/efi)
  2. No this issue when create VM with SCSI disk with both old installer and updated installer online 

  
  VMware' dev will give more detail about it.

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