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124 lines
4.2 KiB
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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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