Grub error: "will not proceed with blocklists."

[Volker Wysk]

Hello

I'm afraid I have broken something. grub-install outputs this message:

desktop ~ % LANG=C grub-install /dev/sda
Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
grub-install: warning: Embedding is not possible.  GRUB can only be installed in this setup by using blocklists.  However, blocklists are UNRELIABLE and their use is discouraged..
grub-install: error: will not proceed with blocklists.

Does this mean that my system won't boot again?

This is my partitioning:

desktop ~ % LANG=C fdisk --list /dev/sda
Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 4E84672C-31E6-42E8-AF97-254EE3E6410B

Device      Start        End    Sectors  Size Type
/dev/sda1    2048       4095       2048    1M Linux filesystem
/dev/sda2    4096     503807     499712  244M Linux filesystem
/dev/sda3  503808 7814035455 7813531648  3.7T Linux filesystem
GPT (END)

What is that sda1 partition? It has been set up by the kubuntu installer, when I started to build my system. What is it good for?

My machine is somewhat old, I don't think that I have EFI.

Bye
Volker