[Bug 1935718] Re: error: failed to register the EFI boot entry: Operation not permitted.

[Steve Langasek]

'EFI variables are not supported on this system.'

That's quite interesting, as it implies the installer was booted via
UEFI, but that, once installed, the system is booting Ubuntu via BIOS
fallback compatibility.  That is definitely not a case we could detect
from the installer whether you could successfully reboot into Ubuntu or
not!

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https://bugs.launchpad.net/bugs/1935718

Title:
  error: failed to register the EFI boot entry: Operation not permitted.

Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  install on a drive with existing windows 10 installation.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ubiquity 21.10.3
  ProcVersionSignature: Ubuntu 5.11.0-20.21+21.10.1-generic 5.11.21
  Uname: Linux 5.11.0-20-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu67
  Architecture: amd64
  CasperMD5CheckResult: pass
  CasperVersion: 1.463
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Jul  9 20:09:14 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  LiveMediaBuild: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210709)
  ProcEnviron:
   LANGUAGE=en_CA.UTF-8
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_CA.UTF-8
   LC_NUMERIC=C.UTF-8
  RebootRequiredPkgs:
   linux-image-5.11.0-20-generic
   linux-base
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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