It´s an old server that dont have the leagacymode. But i got it to work with grub somehow.So if i right understand. You had installed this server successfully? And you would like to reinstall? What is your bootdevice? Look likes ZFS Rootpool? Maybe change to legacymode in the bios...
https://www.reddit.com/r/Proxmox/comments/kppwb3/unable_to_init_esp_and_install_systemdboot_loader/
The strange thing is that I use wd red hdd.1. Check you installation target
2. You CANT BOOT FROM NVMe! unless it U.2 and u have the upgraded backplane.
Did u try to boot to proxmox install go ALT+CTRL F2 or F1 and try to clean the drive by removing partitions? Did u have it installed on the same drive last time? I did hit similar problem on reinstall, when I used dual SD module. Turned out there were read/write issues with card. Check the drive there may be some damage.The strange thing is that I use wd red hdd.
sound like my problem. I only installed over the old partitions.Did u try to boot to proxmox install go ALT+CTRL F2 or F1 and try to clean the drive by removing partitions? Did u have it installed on the same drive last time? I did hit similar problem on reinstall, when I used dual SD module. Turned out there were read/write issues with card. Check the drive there may be some damage.