I'm having the same problem, tried to follow the
wiki going via Debian 12.5 netinstall amd64 iso, setting up a LUKS-encrypted disk with LVM works fine; I added dropbear-initramfs and verified remote unlock works.
But as soon as I
Bash:
apt install proxmox-default-kernel
reboot
everythings breaks. The system gets stuck in initramfs and won't accept any input via local keyboard (after it worked just fine in grub, so a hardware issue or exotic drivers are ruled out). I have managed to get back in to the system via a debian live iso, but found no solution to the problem as of yet.
For now, full disk enryption with LUKS by installing proxmox on top of vanilla debian is not a viable path. Wiki should be updated with a
warning, I can imagine more people running into this.
edit:
So I installed proxmox-default-kernel again and got stuck in the init again, but just typing in the password to my encrypted drive blind (there's no prompt, no blinking cursor) worked... might have from the beginning, can't test anymore.
I modified /etc/initramfs-tools/initramfs.conf to set a static IP and voila, I can login via ssh and get a cryptroot-unlock prompt; all the while, the monitor output is still frozen at "loading initial ramdisk" without a prompt or anything.
I've read somewhere else on the forum that disabling x2APIC in UEFI BIOS might work, going to try that next because the frozen screen is freaking me out