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

[iaincc]

Wht are all New distro ISO files (Oct 2020 on)  now created with GUID
Partition Tables.  ??????

These work fine when used to create USB Boot Sticks for new Secure Boot
systems,

 HOWEVER these ISOs FAIL to load on many BIOS machines.   ( GRUB ERROR -
Command GRUB_PLATFORM missing )


SOLUTION 
=========
mount the GUID based iso on  /dev/loopX using Mount Disk Image.
sudo gdisk  /dev/loopX
Recovery option  (r)    convert to MBR (g)
then use Startup Disk or Gnome Disk or dd to create an MBR based USB Stick

Tested with ubuntustudio-20.10-dvd-amd64.iso and  xubuntu-20.10-dvd-
amd64.iso


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

** Converted to question:
   https://answers.launchpad.net/ubuntu/+source/usb-creator/+question/694495

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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:
  Invalid

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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