how to force grub-boot when efi-boot is broken?

[RolandK]

i have a low-power quadcore pc which has support for efi but, but after install i'm getting to an initramfs prompt and the system won't boot.

i disabled uefi boot in bios and reinstalled,but proxmox installs efi boot, though - and apparently and for my curiosity efi boot is enabled in bios afterwards. same problem - system won't boot.

i'm curious how i can force selection of grub-boot/legacy boot at installation time to overcome this problem.

 

[RolandK]

i found the reason for it and was able to fix it with the informations from https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_systemd_boot

apparently, the installer added wrong entries to efi boot config entry.

the question is, why.

root@t620-2:/mnt/loader/entries# diff proxmox-5.4.34-1-pve.conf proxmox-5.4.34-1-pve.conf.wrong
3c3
< options root=ZFS=rpool/ROOT/pve-1 boot=zfs
---
> options BOOT_IMAGE=/boot/linux26 ro ramdisk_size=16777216 rw quiet splash=silent

i opened the following bugticket for that: https://bugzilla.proxmox.com/show_bug.cgi?id=2925