template.json

{
    "builders": [{
        "type": "sakuracloud",
        "zone": "is1b",
        "os_type": "iso",
        "user_name": "ubuntu",
        "password": "TestUserPassword01",
        "iso_id": 112801105251,
        "disk_size": 20,
        "core" : 2,
        "memory_size": 4,
        "archive_name": "packer-example-ubuntu-from-iso",
        "boot_command": [
            "<esc><enter><wait10>",
            "j<enter><wait><enter><wait><enter><wait><enter><wait><enter><wait><enter><wait1m>",
            "<enter><wait5>",
            "ubuntu<enter><wait><enter><wait>",
            "TestUserPassword01<enter><wait>TestUserPassword01<enter><wait><enter><wait10>",
            "<enter><wait10>",
            "<enter><wait><enter><wait><tab><enter><wait5><enter><wait5><tab><enter><wait2m>",
            "<enter><wait30s>",
            "<enter><wait10>",
            "<down><down><down><down><down><down><down><down><spacebar><enter><wait150s>",
            "<enter><wait1m>",
            "<enter>",
            "<wait>"
        ],
        "boot_wait": "30s"

    }],
    "provisioners":[
    {
        "type": "shell",
        "inline": [
            "echo hoge"
        ]
    }]
}