[Bug 1905491] Re: Recent (Nov 2020) ISO copied to USB Drive cannot load

[Paul Loughman]

This affected me. I downloaded kubuntu-22.10-desktop-amd64.iso on Jan
20, 2023. Initially, I used dd to write the .iso to a 32GB USB stick
(PNY), and again using balena Etcher. In both instances, I booted the
resulting Live USB on my "pre-2015" HP Pavilion g7-1070us Notebook PC. I
was presented with the GRUB menu, but selecting *Try or Install Kubuntu
I was briefly shown "Error can't find grub_platform" and then the
blinking cursor in the upper left corner. A power off is required at
that point. Based on the error message, I Googled and found this report.
The fix; converting the GPT of the created LiveUSB to MBR works. But
this really does need to be addressed and fixed. Not everyone has
modern, UEFI capable, PCs. I don't. Lessor informed users, or those
without the trouble shooting skills, will be turned off by the
experience.

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Title:
  Recent (Nov 2020) ISO copied to USB Drive cannot load

Status in casper package in Ubuntu:
  Invalid
Status in usb-creator package in Ubuntu:
  Confirmed

Bug description:
  2020-11-24 10:58 GMT Downloaded ubuntu-20.10-desktop-amd64.iso  via
  torrent

  Used Startup Disk Creator on two previously working 4GB USB sticks

  Both Print GRUB  then  "Error can't find grub_platform"

  Show a boxed Ubuntu Studio but no live OS is loaded

  Tried on two BIOS based 4core/6core AMD computers - same outcome.

  USB stick can be used to mount ISO ->   /boot   contains some grub
  files

  
  Problem is identical on  :-
  ubuntu-20.10-live server-amd.iso
  ubuntu-20.04.1-live server-amd.iso
  kubuntu-20.04-desktop-amd64.iso

  I suspect that a change in the creation of these ISOs is causing NON-
  UEFI machines to fail to load Grub2 correctly.

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