Bootmanager not booting Ubuntu

[sharkytowers]

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Thinkpad W530 Boot Problem

My system has Windows 10, Archlabs Linux & Haiku installed (GRUB 2 is the bootloader) I successfully (?) added Haiku to GRUB so I get it as an option. When I boot from GRUB I get the Haiku “loading” screen (with the icons), but it just sits there and nothing happens. I can still successfully boot into Linux and Windows. I have tried different settings in the BIOS (Legacy/UEFI/Both) to no avail Any ideas? This kind of thing is on the limits of my knowledge so any help is appreciated. Cheers.