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

[Lucap]

If you look at the freshly written image with Gnome disks , 1st ubuntu
partition , click the cog wheel and choose edit partition you'll notice
that the build team have not enabled the Legacy BIOS bootable option?

If you enable it and click change the drive will now boot , there is
still a really long 20 second pause with a black screen and blinking
cursor but it eventually swaps over to the Ubuntu boot logo and starts.

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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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