grub-install 在 ubuntu 20.04.1 上失败

今天我确实更新了最初安装在 ZFS 上的 Ubuntu 20.04 Root之后的系统。更新时，我看到 grub 有一个更新，它无法运行包含的 grub-install。

所以我决定从指南中重播 grub 安装：

grub-install --target=x86_64-efi --efi-directory=/boot/efi \
    --bootloader-id=ubuntu --recheck --no-floppy

cp -a /boot/efi/EFI /boot/efi2
grub-install --target=x86_64-efi --efi-directory=/boot/efi2 \
    --bootloader-id=ubuntu-2 --recheck --no-floppy

（我在镜子上）

这也失败了。我仍然可以成功重启我的系统，但我猜它仍然运行旧的 grub 二进制文件。

我是唯一一个面临这个问题的人吗？它的发病率是多少？

这里还有一些信息：

 dpkg -l | grep grub
ii  grub-common                          2.04-1ubuntu26.7                      amd64        GRand Unified Bootloader (common files)
ii  grub-efi-amd64                       2.04-1ubuntu26.7                      amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 version)
ii  grub-efi-amd64-bin                   2.04-1ubuntu26.7                      amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 modules)
ii  grub-efi-amd64-signed                1.142.9+2.04-1ubuntu26.7              amd64        GRand Unified Bootloader, version 2 (EFI-AMD64 version, signed)
ii  grub2-common                         2.04-1ubuntu26.7                      amd64        GRand Unified Bootloader (common files for version 2)

跑步 ：

grub-install --target=x86_64-efi --efi-directory=/boot/efi \ --bootloader-id=ubuntu --recheck --no-floppy -vv
...
grub-install: info: writing 656 bytes of a fixup block starting at 0xe000.
grub-install: info: adding a relocation entry for 0xf010.
grub-install: info: adding a relocation entry for 0xf018.
grub-install: info: adding a relocation entry for 0xf028.
grub-install: info: adding a relocation entry for 0xf030.
grub-install: info: adding a relocation entry for 0xf040.
grub-install: info: adding a relocation entry for 0xf048.
grub-install: info: adding 393 padding fixup entries.
grub-install: info: writing 808 bytes of a fixup block starting at 0xf000.
grub-install: info: reading /usr/lib/grub/x86_64-efi/crypto.mod.
grub-install: info: reading /usr/lib/grub/x86_64-efi/gcry_crc.mod.
grub-install: info: reading /usr/lib/grub/x86_64-efi/gzio.mod.
grub-install: info: reading /usr/lib/grub/x86_64-efi/zfs.mod.
grub-install: info: reading /usr/lib/grub/x86_64-efi/part_gpt.mod.
grub-install: info: reading /usr/lib/grub/x86_64-efi/search_fs_uuid.mod.
grub-install: info: reading /boot/grub/x86_64-efi/load.cfg.
grub-install: info: kernel_img=0x556fae524f00, kernel_size=0x1a000.
grub-install: info: the core size is 0x31b40.
grub-install: info: writing 0x34000 bytes.
grub-install: info: copying `/usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed' -> `/boot/efi2/EFI/ubuntu-2/grubx64.efi'.
grub-install: info: copying `/usr/lib/shim/shimx64.efi.signed' -> `/boot/efi2/EFI/ubuntu-2/shimx64.efi'.
grub-install: info: copying `/usr/lib/shim/mmx64.efi' -> `/boot/efi2/EFI/ubuntu-2/mmx64.efi'.
grub-install: info: copying `/usr/lib/shim/BOOTX64.CSV' -> `/boot/efi2/EFI/ubuntu-2/BOOTX64.CSV'.
grub-install: info: copying `/boot/grub/x86_64-efi/load.cfg' -> `/boot/efi2/EFI/ubuntu-2/grub.cfg'.
grub-install: info: copying `/usr/lib/shim/shimx64.efi.signed' -> `/boot/efi2/EFI/BOOT/BOOTX64.EFI'.
grub-install: info: copying `/usr/lib/shim/fbx64.efi' -> `/boot/efi2/EFI/BOOT/fbx64.efi'.
grub-install: info: copying `/usr/lib/shim/mmx64.efi' -> `/boot/efi2/EFI/BOOT/mmx64.efi'.
grub-install: info: Registering with EFI: distributor = `ubuntu-2', path = `\EFI\ubuntu-2\shimx64.efi', ESP at hostdisk//dev/sdl,gpt1.
grub-install: warning: Internal error.
grub-install: error: failed to register the EFI boot entry: Operation not permitted.

我该如何解决 ？