Proxmox install on nmve ssd connected with pcie adapter on dell r720xd.

I want to use Proxmox VE on my Dell R720xd Server. So I booted on the USB stick and installed Proxmox on the pcie nvme ssd.Unfortunately when I boot the Bios doesnt detect my ssd, because it doesnt support pcie connected ssds. So I installed Ubuntu on a USB stick with Grub in hope to first boot onto grub on the usb stick and then select the pcie ssd to boot on.

When I now boot Grubs startups fine and the ssd gets detected, but when I try to boot Proxmox the error below is shown and after...

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