I installed proxmox 5.4 on a server machine where previously ubuntu server 16.04 os was installed. There are two exisitng lvm volumes in the server, which were created by ubuntu server 16.04. The problem that proxmox lvdisplay or vgdisplay show nothing from them and also they are not showing up in proxmox gui either. I tested these lvm-s in ubuntu live server environment and lvdisplay are showing them and also I can mount them. My plan is to use this two exisiting ext4 formatted logical volumes (created by ubuntu server) in proxmox and share them with the VMs and containers. What can be the problem? Thanks for the help!