Ubuntu keeps asking for language select while using preseed in Hyper-V

Packer
1

When I try to run an autoinstall using packer of Ubuntu 24.04.1 I do get stuck on language select page which must not even be shown as the preseed must be load.

After the boot commands are executed the VM shows: loading cloud-init for a while and then just show the Ubuntu wizard that asks to select the language.

Here is the .hcl source part:

source "hyperv-iso" "ubuntu" {
  boot_command = [
    "c",
    "linux /casper/vmlinuz quiet autoinstall ",
    "ds=nocloud-net\\;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed.cfg <enter>",
    "initrd /casper/initrd<enter>",
    "boot<enter>"
  ]
  boot_wait            = "5s"
  communicator         = "ssh"
  cpus                 = 2             
  disk_size            = "46080"     
  enable_secure_boot   = false
  generation           = 2
  guest_additions_mode = "disable"
  http_directory       = "http/"
  iso_checksum         = "sha256:e240e4b801f7bb68c20d1356b60968ad0c33a41d00d828e74ceb3364a0317be9"
  iso_url              = "http://releases.ubuntu.com/noble/ubuntu-24.04.1-live-server-amd64.iso"
  shutdown_command     = "echo 'packer' | sudo -S shutdown -P now"
  ssh_username         = "administrator"
  ssh_password         = "administrator"
  ssh_timeout          = "10m"
  vm_name              = "ubuntu-k3s-vortex"
  memory               = 2048               
  switch_name          = "VMNetworkSwitch" 
  floppy_files         = []
}