I just updated a Dell T340 from PVE7 to 8. I went through all the pve7to8 --full checks and simply followed the documented procedure. I also installed systemd-boot per the docs as I am indeed running UEFI on ZFS. I can still boot into 5.15.143-1. pve7to8 --full still shows as clean with the exception of complaining about the kernel version. I am using systemd to boot as opposed to grub.
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Code:
proxmox-boot-tool status
Re-executing '/usr/sbin/proxmox-boot-tool' in new private mount namespace...Read more