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

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Ubuntu version: 20.10 Groovy Gorilla.
PC motherboard: Gigabyte 880GM-USB3 (rev3.1).
The problem: Using Ubuntu's startup disk creator, I created an image of Groovy Gorilla's ISO onto a pen drive (formatted with NTFS). I booted from the pen drive and am shown an error: "cannot find grub_platform". Then I'm presented with a blank screen with a blinking cursor at the top left corner of the screen. It remains stuck at that.
Someone else who experienced this: https://askubuntu.com/questions/1288476/can-not-install-from-usb-with-error-cannot-find-grub-platform/1335403.

Solution: As pdecat mentioned, converting GPT to MBR helps.

Why this needs fixing: Not everyone uses a modern PC with UEFI support.
Just as in this bug
(https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1867092/comments/28),
all sub-versions of Ubuntu 20 and above, need to be patched to have some
kind of legacy support. Not all users would have sufficient tech
knowledge to search and find this solution.

** Changed in: usb-creator (Ubuntu)
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/1905491

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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