Heyy, would be very (very) thankful for some quick asisstance. I have a full disk encrypted debian installation on hdd that was working fine. Now I installed a proxmox installation on a separate hdd while the debian hdd was unplugged. Plugging debian back in, I now only get a black screen with a blinking underscore (with proxmox plugged out). I think it would be somewhat logical if the harddisk was plugged in since I followed this guide, which did some tampering with grub and kernel, however it wasn't. As far as I can see online, the solution woud be to rescue via external disk and fix kernel/grub. Is it realistic that this is the right solution, should I follow that?