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[#]: collector: (lujun9972)
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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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[#]: subject: (How To Delete A Repository And GPG Key In Ubuntu)
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[#]: via: (https://www.ostechnix.com/how-to-delete-a-repository-and-gpg-key-in-ubuntu/)
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[#]: author: (sk https://www.ostechnix.com/author/sk/)
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How To Delete A Repository And GPG Key In Ubuntu
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======
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![Delete A Repository And GPG Key In Ubuntu][1]
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The other day we discussed how to [**list the installed repositories**][2] in RPM and DEB-based systems. Today, we are going to learn how to delete a repository along with its GPG key in Ubuntu. For those wondering, a repository (shortly **repo** ) is a central place where the developers keep the software packages. The packages in the repositories are thoroughly tested and built specifically for each version by Ubuntu developers. The users can download and install these packages on their Ubuntu system using **Apt** **package manager**. Ubuntu has four official repositories namely **Main** , **Universe** , **Restricted** and **Multiverse**.
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Apart from the official repositories, there are many unofficial repositories maintained by developers (or package maintainers). The unofficial repositories usually have the packages which are not available in the official repositories. All packages are signed with pair of keys, a public and private key, by the package maintainer. As you already know, the public key is given out to the users and the private must be kept secret. Whenever you add a new repository in the sources list, you should also add the repository key if Apt package manager wants to trust the newly added repository. Using the repository keys, you can ensure that you’re getting the packages from the right person. Hope you got a basic idea about software repositories and repository keys. Now let us go ahead and see how to delete the repository and its key if it is no longer necessary in Ubuntu systems.
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### Delete A Repository In Ubuntu
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Whenever you add a repository using “add-apt-repository” command, it will be stored in **/etc/apt/sources.list** file.
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To delete a software repository from Ubuntu and its derivatives, just open the /etc/apt/sources.list file and look for the repository entry and delete it.
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```
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$ sudo nano /etc/apt/sources.list
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```
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As you can see in the below screenshot, I have added [**Oracle Virtualbox**][3] repository in my Ubuntu system.
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![][4]
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virtualbox repository
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To delete this repository, simply remove the entry. Save and close the file.
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If you have added PPA repositories, look into **/etc/apt/sources.list.d/** directory and delete the respective entry.
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Alternatively, you can delete the repository using “add-apt-repository” command. For example, I am deleting the [**Systemback**][5] repository like below.
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```
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$ sudo add-apt-repository -r ppa:nemh/systemback
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```
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Finally, update the software sources list using command:
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```
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$ sudo apt update
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```
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### Delete Repository keys
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We use “apt-key” command to add the repository keys. First, let us list the added keys using command:
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```
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$ sudo apt-key list
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```
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This command will list all added repository keys.
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```
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/etc/apt/trusted.gpg
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--------------------
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pub rsa1024 2010-10-31 [SC]
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3820 03C2 C8B7 B4AB 813E 915B 14E4 9429 73C6 2A1B
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uid [ unknown] Launchpad PPA for Kendek
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pub rsa4096 2016-04-22 [SC]
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B9F8 D658 297A F3EF C18D 5CDF A2F6 83C5 2980 AECF
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uid [ unknown] Oracle Corporation (VirtualBox archive signing key) <[email protected]>
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sub rsa4096 2016-04-22 [E]
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-archive.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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790B C727 7767 219C 42C8 6F93 3B4F E6AC C0B2 1F32
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
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uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
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------------------------------------------------------
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pub rsa4096 2018-09-17 [SC]
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F6EC B376 2474 EDA9 D21B 7022 8719 20D1 991B C93C
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2018) <[email protected]>
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```
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As you can see in the above output, the long (40 characters) hex value is the repository key. If you want APT package manager to stop trusting the key, simply delete it using command:
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```
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$ sudo apt-key del "3820 03C2 C8B7 B4AB 813E 915B 14E4 9429 73C6 2A1B"
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```
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Or, specify the last 8 characters only:
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```
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$ sudo apt-key del 73C62A1B
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```
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Done! The repository key has been deleted. Run the following command to update the repository lists:
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```
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$ sudo apt update
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```
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**Resource:**
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* [**Software repositories – Ubuntu Community Wiki**][6]
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--------------------------------------------------------------------------------
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via: https://www.ostechnix.com/how-to-delete-a-repository-and-gpg-key-in-ubuntu/
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作者：[sk][a]
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选题：[lujun9972][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://www.ostechnix.com/author/sk/
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[b]: https://github.com/lujun9972
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[1]: https://www.ostechnix.com/wp-content/uploads/2019/07/Delete-a-repository-in-ubuntu-720x340.png
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[2]: https://www.ostechnix.com/find-list-installed-repositories-commandline-linux/
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[3]: https://www.ostechnix.com/install-oracle-virtualbox-ubuntu-16-04-headless-server/
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[4]: https://www.ostechnix.com/wp-content/uploads/2019/07/virtualbox-repository.png
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[5]: https://www.ostechnix.com/systemback-restore-ubuntu-desktop-and-server-to-previous-state/
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[6]: https://help.ubuntu.com/community/Repositories/Ubuntu
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@ -0,0 +1,137 @@
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[#]: collector: (lujun9972)
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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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[#]: subject: (How To Delete A Repository And GPG Key In Ubuntu)
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[#]: via: (https://www.ostechnix.com/how-to-delete-a-repository-and-gpg-key-in-ubuntu/)
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[#]: author: (sk https://www.ostechnix.com/author/sk/)
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如何在 Ubuntu 中删除仓库和 GPG 密钥
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======
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![Delete A Repository And GPG Key In Ubuntu][1]
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前几天我们讨论了如何在基于 RPM 和 DEB 的系统中[**列出已安装的仓库**][2]。今天，我们将学习如何在 Ubuntu 中删除仓库及其 GPG 密钥。对于想知道仓库的人，仓库（简称 **repo**）是开发人员存储软件包的地方。仓库的软件包经过全面测试，并由 Ubuntu 开发人员专门为每个版本构建。用户可以使用 **Apt** **包管理器**在他们的 Ubuntu 系统上下载和安装这些包。 Ubuntu 有四个官方仓库，即 **Main**、**Universe**、**Restricted** 和 **Multiverse**。
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除了官方仓库外，还有许多由开发人员（或软件包维护人员）维护的非官方仓库。非官方仓库通常有官方仓库中不可用的包。所有包都由包维护者用一对密钥（公钥和私钥）签名。如你所知，公钥是发给用户的，私人必须保密。每当你在源列表中添加新的仓库时，如果 Apt 包管理器想要信任新添加的仓库，你还应该添加仓库密钥。使用仓库密钥，你可以确保从正确的人那里获得包。到这里希望你对软件仓库和仓库密钥有了一个基本的了解。现在让我们继续看看如果在 Ubuntu 系统中不再需要仓库及其密钥，那么该如何删除它。
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### 在 Ubuntu 中删除仓库
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每当使用 “add-apt-repository” 命令添加仓库时，它都将保存在 **/etc/apt/sources.list** 中。
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要从 Ubuntu 及其衍生版中删除软件仓库，只需打开 /etc/apt/sources.list 文件并查找仓库名字并将其删除即可。
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```
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$ sudo nano /etc/apt/sources.list
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```
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正如你在下面的截图中看到的，我在我的 Ubuntu 系统中添加了 [**Oracle Virtualbox**][3] 仓库。
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![][4]
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virtualbox 仓库
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要删除此仓库，只需删除该条目即可。保存并关闭文件。
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如果你已添加 PPA 仓库，请查看 **/etc/apt/sources.list.d/** 目录并删除相应的条目。
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或者，你可以使用 “add-apt-repository” 命令删除仓库。例如，我要删除 [**Systemback**][5] 仓库，如下所示。
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```
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$ sudo add-apt-repository -r ppa:nemh/systemback
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```
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最后，使用以下命令更新软件源列表：
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```
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$ sudo apt update
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```
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### 删除仓库密钥
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我们使用 “apt-key” 命令添加仓库密钥。首先，让我们使用命令列出添加的密钥：
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```
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$ sudo apt-key list
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```
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此命令将列出所有添加的仓库密钥。
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```
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/etc/apt/trusted.gpg
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--------------------
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pub rsa1024 2010-10-31 [SC]
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3820 03C2 C8B7 B4AB 813E 915B 14E4 9429 73C6 2A1B
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uid [ unknown] Launchpad PPA for Kendek
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pub rsa4096 2016-04-22 [SC]
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B9F8 D658 297A F3EF C18D 5CDF A2F6 83C5 2980 AECF
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uid [ unknown] Oracle Corporation (VirtualBox archive signing key) <[email protected]>
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sub rsa4096 2016-04-22 [E]
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-archive.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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790B C727 7767 219C 42C8 6F93 3B4F E6AC C0B2 1F32
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2012-cdimage.gpg
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------------------------------------------------------
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pub rsa4096 2012-05-11 [SC]
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8439 38DF 228D 22F7 B374 2BC0 D94A A3F0 EFE2 1092
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uid [ unknown] Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
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/etc/apt/trusted.gpg.d/ubuntu-keyring-2018-archive.gpg
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------------------------------------------------------
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pub rsa4096 2018-09-17 [SC]
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F6EC B376 2474 EDA9 D21B 7022 8719 20D1 991B C93C
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uid [ unknown] Ubuntu Archive Automatic Signing Key (2018) <[email protected]>
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```
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正如你在上面的输出中所看到的，那串长的（40 个字符）十六进制值是仓库密钥。如果你希望 APT 包管理器停止信任该密钥，只需使用以下命令将其删除：
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```
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$ sudo apt-key del "3820 03C2 C8B7 B4AB 813E 915B 14E4 9429 73C6 2A1B"
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```
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或者，仅指定最后 8 个字符：
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```
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$ sudo apt-key del 73C62A1B
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```
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完成！仓库密钥已被删除。运行以下命令更新仓库列表：
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```
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$ sudo apt update
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```
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**资源：**
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* [**软件仓库 – Ubuntu 社区 Wiki**][6]
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--------------------------------------------------------------------------------
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||||
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||||
via: https://www.ostechnix.com/how-to-delete-a-repository-and-gpg-key-in-ubuntu/
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||||
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作者：[sk][a]
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选题：[lujun9972][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)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://www.ostechnix.com/author/sk/
|
||||
[b]: https://github.com/lujun9972
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||||
[1]: https://www.ostechnix.com/wp-content/uploads/2019/07/Delete-a-repository-in-ubuntu-720x340.png
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[2]: https://www.ostechnix.com/find-list-installed-repositories-commandline-linux/
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[3]: https://www.ostechnix.com/install-oracle-virtualbox-ubuntu-16-04-headless-server/
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[4]: https://www.ostechnix.com/wp-content/uploads/2019/07/virtualbox-repository.png
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[5]: https://www.ostechnix.com/systemback-restore-ubuntu-desktop-and-server-to-previous-state/
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[6]: https://help.ubuntu.com/community/Repositories/Ubuntu
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Reference in New Issue
Block a user