Merge pull request #28681 from lkxed/20230217-1-Downgrading-a-Package-via-apt-get

[手动选题][tech]: 20230217.1 ⭐️ Downgrading a Package via apt-get.md

sources/tech/20230217.1 ⭐️ Downgrading a Package via apt-get.md

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+[#]: subject: "Downgrading a Package via apt-get"
+[#]: via: "https://itsfoss.com/downgrade-apt-package/"
+[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
+[#]: collector: "lkxed"
+[#]: translator: " "
+[#]: reviewer: " "
+[#]: publisher: " "
+[#]: url: " "
+
+Downgrading a Package via apt-get
+======
+
+In a situation where a recently upgraded software is causing issues?
+
+While you can always investigate the issue to fix it, at times, going back to the previous working version saves time and effort.
+
+If the new version introduced a bug, you could do nothing on your end, right?
+
+The good thing is that you can easily downgrade an apt package in Ubuntu and Debian.
+
+All you have to do is to use the apt command like this:
+
+```
+sudo apt install package_name=package-version-number
+```
+
+That seems easy enough but how would you get the exact version number? Which old versions are supported? You can get that detail with:
+
+```
+sudo apt-cache policy package_name
+```
+
+Let me explain all this with a real-life example.
+
+### Downgrading apt package
+
+Recently, I was updating the Ubuntu server that hosts It's FOSS Community forum.
+
+I did the usual apt update && apt upgrade and things went bonkers by the time updates were installed.
+
+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.
+
+Check the currently installed package version
+
+![Installed Docker version][1]
+
+Then check for the available versions that could be installed:
+
+```
+sudo apt-cache policy package_name
+```
+
+It may throw a huge list or just a small one:
+
+![All installable versions of an apt package][2]
+
+If it shows at least one older version than the current one, you are in luck.
+
+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.
+
+Basically, you copy the entire stuff before 500 (the priority number).
+
+```
+brave-browser:
+  Installed: 1.48.158
+  Candidate: 1.48.164
+  Version table:
+     1.48.164 500
+        500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
+ *** 1.48.158 500
+        500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
+        100 /var/lib/dpkg/status
+     1.47.186 500
+        500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
+     1.47.171 500
+        500 https://brave-browser-apt-release.s3.brave.com stable/main amd64 Packages
+     1.46.153 500
+```
+
+Once you have got the package number, use it to downgrade the installed package like this:
+
+```
+sudo apt install package_name=package-version-number
+```
+
+![Downgrading an installed package via apt-get command][3]
+
+You'll see a warning about downgrading the package, of course.
+
+![Downgrading apt package][4]
+
+But once the process completes, your package would have been downgraded to the given older version.
+
+### So, hold it, maybe?
+
+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.
+
+Don't want that? You can [prevent a package from being updated][5]. Use the apt-mark command like this:
+
+```
+sudo apt-mark hold package_name
+```
+
+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.
+
+--------------------------------------------------------------------------------
+
+via: https://itsfoss.com/downgrade-apt-package/
+
+作者：[Abhishek Prakash][a]
+选题：[lkxed][b]
+译者：[译者ID](https://github.com/译者ID)
+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://itsfoss.com/author/abhishek/
+[b]: https://github.com/lkxed/
+[1]: https://itsfoss.com/content/images/2023/02/installed-docker-version.png
+[2]: https://itsfoss.com/content/images/2023/02/available-docker-versions.png
+[3]: https://itsfoss.com/content/images/2023/02/downgrading-installed-packages.png
+[4]: https://itsfoss.com/content/images/2023/02/downgrading-installed-package.png
+[5]: https://itsfoss.com/prevent-package-update-ubuntu/