[Bug 1964642] [NEW] Packer virtualbox ssh can't connect to unattended Ubuntu 20.04.1/2/3/4 but can connect to Ubuntu 20.4

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Two years ago I was able to create a Virtualbox Ubuntu 20.04 guest in a Windows 10 host with Packer 1.5.6, using an unattended installation.
The Packer command was:
      "boot_command": [
        "<enter><enter><f6><esc><wait> ",
        "autoinstall ds=nocloud-net;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/",
        "<enter>"
      ],
The user-data file was:
#cloud-config
autoinstall:
  version: 1
  identity:
    realname: mclibre
    hostname: ubuntu
    password: '$6$mclibre$YiuRPSZM3ZXVe4UyIqv1dvy9rUjf5/LsGCkDyaex.WN45wzVTuRmW5QLuctuicGAFZIO2M3QR8NLdtQYatKTn1'
    username: mclibre
  locale: es_ES.UTF-8
  keyboard:
    layout: es
  network:
    network:
      version: 2
      ethernets:
        ens33: {dhcp4: true, dhcp-identifier: mac}
  ssh:
    install-server: true
  late-commands:
    - sed -i 's/^#*\(send dhcp-client-identifier\).*$/\1 = hardware;/' /target/etc/dhcp/dhclient.conf
    - 'sed -i "s/dhcp4: true/&\n      dhcp-identifier: mac/" /target/etc/netplan/00-installer-config.yaml'
Now, I have tried to create a Virtualbox Ubuntu 20.04.4/.3/.2/.1 guest using packer 1.5.6 but Packer can't create the image because once the installation is done, after rebooting the SSH server does not answer (the packer log error says: SSH handshake err: Timeout during SSH handshake).
I have tried with the last version of Packer, Packer 1.8.0, and the result is the same. I can create a Ubuntu Server 20.4 image but not a Ubuntu Server 20.4.1, .2, .3 or .4 image.
I can provide as much aditional information as you want.
Thanking you in advance,
Bartolome Sintes

** Affects: openssh (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment packer ssh unattended virtualbox
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Packer virtualbox ssh can't connect to unattended Ubuntu 20.04.1/2/3/4 but can connect to Ubuntu 20.4
https://bugs.launchpad.net/bugs/1964642
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