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Volume group "pve" not found
Cannot process volume group pve
Unable to find LVM volume pve/root
like this picture
just reboot then
choese menu
Advanced options for Proxmox Virutal Enviroment
then press e
then add rootdelay=2 after pve-root ro quiet
before
after
then ctrl+x now can boot success!
!!! remeber change /boot/grub/grub.cfg
https://forum.proxmox.com/threads/solved-proxmox-4-pve-not-found-after-first-start.24702/