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

[Barto]

systemctl status (2)

** Attachment added: "3_systemctl_status_2.png"
   https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1964642/+attachment/5570197/+files/3_systemctl_status_2.png

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Title:
  Packer virtualbox ssh can't connect to unattended Ubuntu 20.04.1/2/3/4
  but can connect to Ubuntu 20.4

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  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

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