Comment 3 for bug 1851008

Nov 2 07:33:26 ubuntu grub-installer: info: Running chroot /target grub-install --force "/dev/sda"
Nov 2 07:33:26 ubuntu grub-installer: Installing for x86_64-efi platform.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: efivarfs_get_variable: open(/sys/firmware/efi/efivars/blk0-47c7b225-c42a-11d2-8e57-00a0c969723b): No such file or directory.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: efi_get_variable: ops->get_variable failed: No such file or directory.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: is_gpt_valid: GUID Partition Table Header signature is wrong: 0 != 5452415020494645: Invalid argument.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: is_gpt_valid: GUID Partition Table Header signature is wrong: 0 != 5452415020494645: Invalid argument.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: msdos_disk_get_extended_partition_info: extended partition info is not supported: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: msdos_disk_get_partition_info: could not get extended partition info: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: get_partition_info: neither MBR nor GPT is valid: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: make_hd_dn: could not get partition info: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: efi_va_generate_file_device_path_from_esp: could not make HD() DP node: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: warning: efi_generate_file_device_path_from_esp: could not generate File DP from ESP: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: grub-install: error: failed to register the EFI boot entry: Function not implemented.
Nov 2 07:33:40 ubuntu grub-installer: error: Running 'grub-install --force "/dev/sda"' failed.