Packer experienced an authentication error when trying to connect via SSH

[lestephane]

When I do packer buildwith packer 1.6, I'm getting the error below. Is there some additional configuration I need to tweak?

==> ubuntu-2004: Error waiting for SSH: Packer experienced an authentication error when trying to connect via SSH. This can happen if your username/password are wrong. You may want to double-check your credentials as part of your debugging process. original error: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none password], no supported methods remain
==> ubuntu-2004: Cleaning up floppy disk...
==> ubuntu-2004: Deregistering and deleting VM...
==> ubuntu-2004: Deleting output directory...
Build 'ubuntu-2004' errored: Packer experienced an authentication error when trying to connect via SSH. This can happen if your username/password are wrong. You may want to double-check your credentials as part of your debugging process. original error: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none password], no supported methods remain

==> Some builds didn't complete successfully and had errors:
--> ubuntu-2004: Packer experienced an authentication error when trying to connect via SSH. This can happen if your username/password are wrong. You may want to double-check your credentials as part of your debugging process. original error: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none password], no supported methods remain

Note that I had to run packer fix because i was getting the error.

Error: Failed to prepare build: "ubuntu-2004"

1 error occurred:
	* Deprecated configuration key: 'iso_checksum_type'. Please call `packer fix`
against your template to update your template to be compatible with the current
version of Packer. Visit https://www.packer.io/docs/commands/fix/ for more
detail.

[mightywomble]

same

[mightywomble]

If you are finding that your packer is telling you to fix this json file you create or that while building the packer image you're getting ssh timeouts around 4 to 6 minutes in.. this json based of the original one works.
{ "builders": [ { "boot_command": [ "<enter><enter><f6><esc><wait> ", "autoinstall ds=nocloud-net;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/", "<enter>" ], "boot_wait": "5s", "guest_additions_path": "VBoxGuestAdditions_{{.Version}}.iso", "guest_os_type": "ubuntu-64", "headless": false, "http_directory": "http", "iso_checksum": "sha256:443511f6bf12402c12503733059269a2e10dec602916c0a75263e5d990f6bb93", "iso_url": "https://releases.ubuntu.com/20.04.1/ubuntu-20.04.1-live-server-amd64.iso", "memory": 2048, "name": "ubuntu-2004-root", "shutdown_command": "echo 'vagrant'|sudo -S shutdown -P now", "ssh_timeout": "1h1m1s", "ssh_read_write_timeout": "1h1m1s", "ssh_handshake_attempts": "200", "ssh_password": "vagrant", "ssh_username": "vagrant", "type": "virtualbox-iso", "vboxmanage": [ [ "modifyvm", "{{.Name}}", "--memory", "2048" ], [ "modifyvm", "{{.Name}}", "--cpus", "2" ] ], "virtualbox_version_file": ".vbox_version", "vm_name": "packer-ubuntu-20.04-amd64" } ], "post-processors": [ { "compression_level": "8", "output": "output/ubuntu-20.04.box", "type": "vagrant" } ], "provisioners": [ { "execute_command": "echo 'vagrant' | {{.Vars}} sudo -S -E bash '{{.Path}}'", "script": "scripts/init.sh", "type": "shell" }, { "execute_command": "echo 'vagrant' | {{.Vars}} sudo -S -E bash '{{.Path}}'", "script": "scripts/cleanup.sh", "type": "shell" } ] }

[mightywomble]

{
"builders": [
{
"boot_command": [
" ",
"autoinstall ds=nocloud-net;s=http://{{ .HTTPIP }}:{{ .HTTPPort }}/",
""
],
"boot_wait": "5s",
"guest_additions_path": "VBoxGuestAdditions_{{.Version}}.iso",
"guest_os_type": "ubuntu-64",
"headless": false,
"http_directory": "http",
"iso_checksum": "sha256:443511f6bf12402c12503733059269a2e10dec602916c0a75263e5d990f6bb93",
"iso_url": "https://releases.ubuntu.com/20.04.1/ubuntu-20.04.1-live-server-amd64.iso",
"memory": 2048,
"name": "ubuntu-2004-root",
"shutdown_command": "echo 'vagrant'|sudo -S shutdown -P now",
"ssh_timeout": "1h1m1s",
"ssh_read_write_timeout": "1h1m1s",
"ssh_handshake_attempts": "200",
"ssh_password": "vagrant",
"ssh_username": "vagrant",
"type": "virtualbox-iso",
"vboxmanage": [
[
"modifyvm",
"{{.Name}}",
"--memory",
"2048"
],
[
"modifyvm",
"{{.Name}}",
"--cpus",
"2"
]
],
"virtualbox_version_file": ".vbox_version",
"vm_name": "packer-ubuntu-20.04-amd64"
}
],
"post-processors": [
{
"compression_level": "8",
"output": "output/ubuntu-20.04.box",
"type": "vagrant"
}
],
"provisioners": [
{
"execute_command": "echo 'vagrant' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
"script": "scripts/init.sh",
"type": "shell"
},
{
"execute_command": "echo 'vagrant' | {{.Vars}} sudo -S -E bash '{{.Path}}'",
"script": "scripts/cleanup.sh",
"type": "shell"
}
]
}