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geekpi
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[#]: subject: "Fixing “cannot find signatures with metadata for snap” Error in Ubuntu and other Linux"
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[#]: via: "https://itsfoss.com/snap-metadata-signature-error/"
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[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
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[#]: collector: "lkxed"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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Fixing “cannot find signatures with metadata for snap” Error in Ubuntu and other Linux
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======
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The other day I was trying to install [massCode][1] application. For installation, it provided a Snap file to download.
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When I tried to install the application from Snap file
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```
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sudo snap install snap_file
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```
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It gave me the following error:
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**error: cannot find signatures with metadata for snap “masscode_2.6.1_amd64.snap”**
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![cannot find signature with metadata for snap][2]
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That was strange. While [adding external repositories in Ubuntu][3], you have to add the GPG key. But no such things were provided by the developer here.
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The ‘fix’ is easy and simple. Let me explain it to you.
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### Handling “cannot find signatures with metadata for snap” error
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There are no signatures involved here.
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What happens is that you have downloaded a Snap installer file from a third party. The snap mechanism in Ubuntu expects you to get the snap packages from the official snap store.
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Since it doesn’t come from the snap store, you see the ‘cannot find signatures with metadata for snap’ error message. The error message is not descriptive, like most error messages.
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So, what’s the solution here?
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Any snap package that is not distributed through the Snap store has to be installed with the**–dangerous flag**. That’s the rule.
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```
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sudo snap install --dangerous path_to_snap_file
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```
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This way, you tell the snap package manager to explicitly install the snap package.
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Here, I used this flag and was able to install massCode from its snap package successfully.
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![installing third party snap packages][4]
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How ‘dangerous’ is it to install snap packages this way? Almost the same as downloading and [installing packages in deb format][5].
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In my opinion, if you are downloading the snap package from the project developer’s website, you are already entrusting the project. In such cases, you can install it with the –dangerous flag.
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Of course, you should first search if the package is available in the snap store or not:
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```
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snap find package_name
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```
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I hope this quick little tip helped you fix the Snap error. If you have questions or suggestions please let me know. If you want to learn more, see [this guide on using Snap commands][6].
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/snap-metadata-signature-error/
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作者：[Abhishek Prakash][a]
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选题：[lkxed][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/abhishek/
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[b]: https://github.com/lkxed
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[1]: https://masscode.io/
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[2]: https://itsfoss.com/wp-content/uploads/2022/07/cannot-find-signature-with-metadata-for-snap-800x205.png
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[3]: https://itsfoss.com/adding-external-repositories-ubuntu/
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[4]: https://itsfoss.com/wp-content/uploads/2022/07/installing-third-party-snap-packages-800x358.png
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[5]: https://itsfoss.com/install-deb-files-ubuntu/
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[6]: https://itsfoss.com/use-snap-packages-ubuntu-16-04/
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@ -0,0 +1,83 @@
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[#]: subject: "Fixing “cannot find signatures with metadata for snap” Error in Ubuntu and other Linux"
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[#]: via: "https://itsfoss.com/snap-metadata-signature-error/"
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[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
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[#]: collector: "lkxed"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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修复 Ubuntu 和其他 Linux 中的 “cannot find signatures with metadata for snap” 错误
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======
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前几天我试图安装 [massCode][1] 应用。对于安装，它提供了一个 Snap 文件以供下载。
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当我尝试从 Snap 文件安装应用程序时
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```
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sudo snap install snap_file
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```
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它给了我以下错误：
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**error: cannot find signatures with metadata for snap “masscode_2.6.1_amd64.snap”**
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![cannot find signature with metadata for snap][2]
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这很奇怪。[在 Ubuntu 中添加外部仓库][3]时，你必须添加 GPG 密钥。但是这里的开发人员没有提供这样的东西。
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“修复”简单易行。让我给你解释一下。
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### 处理 “cannot find signatures with metadata for snap” 错误
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这里不涉及签名。
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发生的情况是你从第三方下载了 Snap 安装程序。 Ubuntu 中的 snap 机制希望你从官方 snap 商店获取 snap 包。
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由于它不是来自 snap 商店，因此你会看到 “cannot find signatures with metadata for snap” 的错误消息。与大多数错误消息一样，错误消息不是描述性的。
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那么，这里的解决方案是什么？
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任何未通过 Snap 商店分发的 snap 包都必须使用 **-dangerous** 选项进行安装。这就是规则。
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```
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sudo snap install --dangerous path_to_snap_file
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```
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这样，你告诉 snap 包管理器显式安装 snap 包。
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在这里，我使用了这个选项并且能够成功地从它的 snap 包中安装 massCode。
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![installing third party snap packages][4]
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以这种方式安装 snap 包有多“危险”？几乎和下载并[安装 deb 格式安装包][5]相同。
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在我看来，如果你是从项目开发者的网站上下载 snap 包，你已经在信任项目了。在这种情况下，你可以使用 –dangerous 选项安装它。
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当然，你应该首先搜索该软件包是否在 snap 商店中可用：
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```
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snap find package_name
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```
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我希望这个快速的小技巧可以帮助你修复 Snap 错误。如果你有任何问题或建议，请告诉我。如果你想了解更多信息，请参阅[这个使用 Snap 命令指南][6]。
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/snap-metadata-signature-error/
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作者：[Abhishek Prakash][a]
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选题：[lkxed][b]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://itsfoss.com/author/abhishek/
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[b]: https://github.com/lkxed
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[1]: https://masscode.io/
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[2]: https://itsfoss.com/wp-content/uploads/2022/07/cannot-find-signature-with-metadata-for-snap-800x205.png
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[3]: https://itsfoss.com/adding-external-repositories-ubuntu/
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[4]: https://itsfoss.com/wp-content/uploads/2022/07/installing-third-party-snap-packages-800x358.png
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[5]: https://itsfoss.com/install-deb-files-ubuntu/
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[6]: https://itsfoss.com/use-snap-packages-ubuntu-16-04/
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