ready to try

data/QuickAndDirty/test.pkr.hcl

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+packer {
+}
+
+source "proxmox" "ubuntu" {
+    image  = "ubuntu:focal"
+    proxmox_url = "http:/192.168.111.34:8006/api2/json"
+    commit = true
+    username = "proxmox_user"
+    password = "tvowyfv9gh23sdfAERtLWav2674"
+    proxmox_url = "https://192.168.111.34:8006/api2/json"
+    node = "grosnoeud"
+    iso_file = "local:ISOS/ubuntu-20.04.3-live-server-amd64.iso"
+    iso_checksum = "f8e3086f3cea0fb3fefb29937ab5ed9d19e767079633960ccb50e76153effc98"
+    insecure_skip_tls_verify = true
+    pool = "FAST"
+    vm_name = "VM-UBU_PackerTest"
+    vm_id = 654
+    memory = 1024
+    core = 1
+    sockets = 2
+    os = "l26"
+    boot_command = [
+      "<esc><wait>",
+      "<esc><wait>",
+      "<enter><wait>",
+      "/install/vmlinuz",
+      " auto=true",
+      " url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg",
+      " locale=en_US<wait>",
+      " console-setup/ask_detect=false<wait>",
+      " console-setup/layoutcode=us<wait>",
+      " console-setup/modelcode=pc105<wait>",
+      " debconf/frontend=noninteractive<wait>",
+      " debian-installer=en_US<wait>",
+      " fb=false<wait>",
+      " initrd=/install/initrd.gz<wait>",
+      " kbd-chooser/method=us<wait>",
+      " keyboard-configuration/layout=USA<wait>",
+      " keyboard-configuration/variant=USA<wait>",
+      " netcfg/get_domain=vm<wait>",
+      " netcfg/get_hostname=packer<wait>",
+      " grub-installer/bootdev=/dev/sda<wait>",
+      " noapic<wait>",
+      " -- <wait>",
+      "<enter><wait>"
+    ]
+}
+
+build {
+    name = "packer-ubuntu"
+    sources = [ "source.proxmox.ubuntu" ]
+}