[Bug 1902557] Re: 20.10 grub-install failure

[William D Waddington]

Well duh, it was right there in black and white: it's defaulting to an
efi install.  That's new.

Fix is adding --target=i386-pc to the install command.

Now if I could just get persistence to work...

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https://bugs.launchpad.net/bugs/1902557

Title:
  20.10 grub-install failure

Status in grub-installer package in Ubuntu:
  New

Bug description:
  Once again trying to build my multi-boot flash drives and external
  SSDs with the latest Ubuntu.

  Contents of the ISO to a FAT32-formatted flash drive.  Boot in UEFI
  mode and install grub to allow also booting in legacy mode.  20.04
  works.  20.10 fails.  Test machine: ThinkPad X1 Yoga Gen 5.

  20.04:

  ubuntu at ubuntu:~$ sudo su
  root at ubuntu:/home/ubuntu# mount -o remount rw /cdrom
  root at ubuntu:/home/ubuntu# grub-install --force --no-floppy --boot-directory=/cdrom/boot  /dev/sda
  Installing for i386-pc platform.
  Installation finished. No error reported.
  root at ubuntu:/home/ubuntu# 

  
  20.10:

  ubuntu at ubuntu:~$ sudo su
  root at ubuntu:/home/ubuntu# mount -o remount rw /cdrom
  root at ubuntu:/home/ubuntu# grub-install --force --no-floppy --boot-directory=/cdrom/boot  /dev/sda
  Installing for x86_64-efi platform.
  grub-install: error: cannot find EFI directory.
  root at ubuntu:/home/ubuntu# 

  
  I realize that live boot isn't a priority other than compatibility testing and installation but this constant breakage (persistence, looped ISO booting...) makes my intended use impossible. Multiboot external drives with Ubuntu as the base distro are very useful for recovery and forensics - when they work...

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