Proxmox - Unable to find LVM volume pve/root

Environment

Poxmox Version:4.3
Kernel: 4.4.19-1-pve

Eroor Message

Volume group "pve" not found
Skipping Volume group pve
Unable to find LVM volume pve/root

Solution

On Grub Boot Menue Press "e", then add "rootdelay=10"
-> linux /vmlinuz-2.6.32-17-pve root=/dev/mapper/pve-root ro rootdelay=10 quiet

Reference

Proxmox Install on USB-Device