GPT and BIOS setup, failing

Hi all,

I am trying to install 11.10 on a GPT disk, if fails at the software install
and GRUB install step.

Using the alternate installer AMD64 ISO.

Disk layout:

root@ubuntu:/home/ubuntu# gdisk /dev/sda
GPT fdisk (gdisk) version 0.6.14

Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p
Disk /dev/sda: 1465149168 sectors, 698.6 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 8C5F38B2-BFAB-4A48-8720-5E6BB4434046
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1465149134
Partitions will be aligned on 2048-sector boundaries
Total free space is 1058782 sectors (517.0 MiB)

Number Start (sector) End (sector) Size Code Name
1 2048 411647 200.0 MiB EF00 EFI System
2 675840 677887 1024.0 KiB EF02 BIOS boot partition
3 942080 3039231 1024.0 MiB 0700 Linux/Windows data
4 3303424 1464884942 696.9 GiB 8E00 Linux LVM

Using the 3rd partition as /boot with btrfs.
4th partition as LUKS container with LVM, takes up rest of the disk.

GRUB install fails with cannot find /target/ error.

From what I understand Second stage Grub2 files need to go to EF02 partition
(#2 in this case).
Not sure how to do this as Ubuntu installer does not give an option to
choose specific partitions to install Grub.

I am not even sure I got the partition scheme right.

Anyone who's tried this before shed some light on how to setup the
partitions under GPT on a BIOS system.

Kind regards,
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