I just watched Jay’s Proxmox VE - How to build an Ubuntu 22.04 template (updated method), only I used AlmaLinux 9.5.
I cloned the template and started the VM, but when I switched to the console I only see “starting serial terminal on interface serial0” and that’s it. No way to log in.
When you have the serial console up and the message “starting serial terminal on interface serial0” appears have you tried pressing the enter/return key on your keyboard?