EFI boot order is not preserved between guest launches

[AnrDaemon]

VB 4.12, WinXP x86/SP3 host.
64-bit Ubuntu guest.
Each time I start guest system, EFI boot order is reset to DVD>HDD>Shell.
If I go to "Boot Maintenance Manager" -> "Boot Options" -> "Add Boot Option" -> disk\EFI\ubuntu\grubx64.efi
Then change boot order to boot from file before shell, the guest system boot up fine after reset, but the changes are lost after guest shutdown.

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GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print                                                            
Model: ATA VBOX HARDDISK (scsi)
Disk /dev/sda: 10.7GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system     Name  Flags
 1      1049kB  345MB   344MB   fat32           EFI   msftdata
 2      345MB   2377MB  2032MB  linux-swap(v1)  swap
 3      2377MB  10.7GB  8340MB  ext4            root

[Perryg]

VBox EFI was not really designed for Linux. It was so users that have apple hardware could install Mac OS X as a guest.

However that said it does work, but you need to create a startup.nsh file in / of the launcher

[AnrDaemon]

Can you please point me to an example of such file, and where exactly it should be located? (I.e. in the root of EFI partition?)

[Perryg]

Launch the guest and go to the startup screen. Wait it out and you will be at a shell prompt. Type edit startup.nsh and add the location of the grubx64.efi file. save and restart.
The installer has the help functions built in to see what the save and exit keys are.

[AnrDaemon]

Solved it with a little googling,

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sudo -e /boot/efi/startup.nsh

from the guest OS and

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fs0:\EFI\ubuntu\grubx64.efi

in there.
Thanks!