Ok.  Ian, Sri, could you also both check whether running efibootmgr on
Ubuntu 19.10 succeeds?  Probably the easiest check is a no-op rewrite of
the boot order variable.  Ian, for you the command would be:

sudo efibootmgr -o 0000,3000,0001,0002,2001,2002,2003; echo $?

Sri, for you the command would be:

sudo efibootmgr -o 0000,0003,0004,0001; echo $?

Please post the complete output of this command.

This will help us determine whether there is a bug in the grub
implementation of variable writing, or if there's a bug in the
underlying libraries used by both grub and efibootmgr.

** Also affects: grub2 (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1851955

Title:
  ubuntu 19.10 boot installer failed

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