未配置本地存储的离线镜像

Question

我正在使用 Aptly 将 ubuntu (主) repo 的副本发布到 USB 记忆棒上，以供离线机器使用。（使用此视频作为参考：https://www.youtube.com/watch?v=rZsJZ_1vX3o）

但是，当我尝试使用以下命令发布快照时：

sudo aptly publish snapshot -skip-contents -skip-signing ubuntu_amd64 filesystem:packages:ubuntu-amd64

我收到此错误：

ERROR: published local storage packages not configured

我的 .aptly.conf 如下所示：

{
  "rootDir": "$HOME/.aptly",
  "downloadConcurrency": 16,
  "downloadSpeedLimit": 0,
  "architectures": ["amd64"],
  "dependencyFollowSuggests": false,
  "dependencyFollowRecommends": false,
  "dependencyFollowAllVariants": false,
  "dependencyFollowSource": false,
  "dependencyVerboseResolve": false,
  "gpgDisableSign": true,
  "gpgDisableVerify": true,
  "gpgProvider": "gpg",
  "downloadSourcePackages": false,
  "skipLegacyPool": true,
  "ppaDistributorID": "ubuntu",
  "ppaCodename": "",
  "skipContentsPublishing": false,
  "FileSystemPublishEndpoints": {
    "packages": {
      "rootDir": "/repo/public/packages",
      "linkMethod": "hardlink"
    }
},
  "S3PublishEndpoints": {},
  "SwiftPublishEndpoints": {}
}

有人能给我指明正确的方向吗？