Ubuntu
usb-creator package

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

Asked by iaincc

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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Ubuntu usb-creator Edit question
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This question was originally filed as bug #1905491.

Revision history for this message
iaincc (iain-clapham) said : 		#1

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

Revision history for this message
Launchpad Janitor (janitor) said : 		#2

This question was expired because it remained in the 'Open' state without activity for the last 15 days.