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[#]: subject: "Downgrading a Package via apt-get"
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[#]: via: "https://itsfoss.com/downgrade-apt-package/"
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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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Downgrading a Package via apt-get
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======
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In a situation where a recently upgraded software is causing issues?
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While you can always investigate the issue to fix it, at times, going back to the previous working version saves time and effort.
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If the new version introduced a bug, you could do nothing on your end, right?
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The good thing is that you can easily downgrade an apt package in Ubuntu and Debian.
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All you have to do is to use the apt command like this:
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```
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sudo apt install package_name=package-version-number
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```
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That seems easy enough but how would you get the exact version number? Which old versions are supported? You can get that detail with:
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```
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sudo apt-cache policy package_name
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```
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Let me explain all this with a real-life example.
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### Downgrading apt package
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Recently, I was updating the Ubuntu server that hosts It's FOSS Community forum.
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I did the usual apt update && apt upgrade and things went bonkers by the time updates were installed.
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Apparently, the latest version of Docker didn't support the aufs storage driver. To reduce the downtime, I opted to downgrade to the previous Docker version.
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Check the currently installed package version
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![Installed Docker version][1]
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Then check for the available versions that could be installed:
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```
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sudo apt-cache policy package_name
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```
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It may throw a huge list or just a small one:
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![All installable versions of an apt package][2]
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If it shows at least one older version than the current one, you are in luck.
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Now, you may think that the version number of a package would be composed of just the numbers. But that may not always be the case.
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Basically, you copy the entire stuff before 500 (the priority number).
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```
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brave-browser:
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Installed: 1.48.158
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Candidate: 1.48.164
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Version table:
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1.48.164 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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*** 1.48.158 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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100 /var/lib/dpkg/status
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1.47.186 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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1.47.171 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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1.46.153 500
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```
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Once you have got the package number, use it to downgrade the installed package like this:
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```
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sudo apt install package_name=package-version-number
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```
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![Downgrading an installed package via apt-get command][3]
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You'll see a warning about downgrading the package, of course.
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![Downgrading apt package][4]
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But once the process completes, your package would have been downgraded to the given older version.
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### So, hold it, maybe?
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So, you just learned to downgrade apt packages. But if you don't pay attention, the package will be upgraded again with the next system update.
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Don't want that? You can [prevent a package from being updated][5]. Use the apt-mark command like this:
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```
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sudo apt-mark hold package_name
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```
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I hope this quick tip helps you with downgrading the apt packages when the need arises. Let me know if you have questions or suggestions.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/downgrade-apt-package/
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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://itsfoss.com/content/images/2023/02/installed-docker-version.png
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[2]: https://itsfoss.com/content/images/2023/02/available-docker-versions.png
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[3]: https://itsfoss.com/content/images/2023/02/downgrading-installed-packages.png
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[4]: https://itsfoss.com/content/images/2023/02/downgrading-installed-package.png
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[5]: https://itsfoss.com/prevent-package-update-ubuntu/
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@ -0,0 +1,123 @@
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[#]: subject: "Downgrading a Package via apt-get"
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[#]: via: "https://itsfoss.com/downgrade-apt-package/"
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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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通过 apt-get 降级一个软件包
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======
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最近升级的软件引起问题了？
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虽然你总是可以调查问题以解决它，但有时，回到以前的工作版本可以节省时间和精力。
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如果新的版本引入了一个 bug，你可以在你这一边什么都不做，对吗？
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好消息是，你可以在 Ubuntu 和 Debian 中轻松地降级 apt 软件包。
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你所要做的就是像这样使用 apt 命令：
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```
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sudo apt install package_name=package-version-number
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```
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这似乎很容易，但你如何获得确切的版本号？哪些旧版本被支持？你可以通过以下方式获得这个细节：
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```
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sudo apt-cache policy package_name
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```
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让我用一个现实生活中的例子来解释这些。
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### 降级 apt 包
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最近，我正在更新承载 It's FOSS 社区论坛的 Ubuntu 服务器。
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我做了通常的apt update && apt upgrade，在更新安装时，事情变得糟糕。
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很明显，最新版本的 Docker 不支持 aufs 存储驱动。为了减少停机时间，我选择了降级到以前的 Docker 版本。
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检查当前安装的软件包版本。
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![Installed Docker version][1]
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然后检查可以安装的可用版本：
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```
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sudo apt-cache policy package_name
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```
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它可能会抛出一个巨大的列表，或者只是一个小列表：
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![All installable versions of an apt package][2]
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如果它显示至少有一个比当前版本更早的版本，你就很幸运了。
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现在，你可能认为一个软件包的版本号将只由数字组成。但情况可能并不总是这样。
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基本上，你复制 500（优先级数字）之前的全部内容。
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```
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brave-browser:
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Installed: 1.48.158
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Candidate: 1.48.164
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Version table:
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1.48.164 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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*** 1.48.158 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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100 /var/lib/dpkg/status
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1.47.186 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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1.47.171 500
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500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
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1.46.153 500
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```
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当你得到了软件包的编号，用它来降级已安装的软件包，像这样：
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```
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sudo apt install package_name=package-version-number
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```
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![Downgrading an installed package via apt-get command][3]
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当然，你会看到一个关于降级软件包的警告。
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![Downgrading apt package][4]
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但是当这个过程完成，你的软件包就会被降级到给定的旧版本。
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### 所以，也许要保持它？
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所以，你刚刚学会了降级 apt 软件包。但如果你不注意的话，该软件包会在下一次系统更新时再次升级。
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不希望这样吗？你可以[阻止一个软件包被更新][5]。像这样使用 apt-mark 命令：
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```
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sudo apt-mark hold package_name
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```
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我希望这个快速技巧能帮助你在需要时降级 apt 软件包。如果你有问题或建议，请告诉我。
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/downgrade-apt-package/
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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://itsfoss.com/content/images/2023/02/installed-docker-version.png
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[2]: https://itsfoss.com/content/images/2023/02/available-docker-versions.png
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[3]: https://itsfoss.com/content/images/2023/02/downgrading-installed-packages.png
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[4]: https://itsfoss.com/content/images/2023/02/downgrading-installed-package.png
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[5]: https://itsfoss.com/prevent-package-update-ubuntu/
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