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[Translated]20150728 How To Fix--There is no command installed for 7-zip archive files.md
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Translating by GOLinux!
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How To Fix: There is no command installed for 7-zip archive files
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================================================================================
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### Problem ###
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I was trying to install Emerald icon theme in Ubuntu and the theme came in .7z archive. As always, I tried to extract it, in GUI, using the right click and “extract here”. Instead of extracting the file, Ubuntu 15.04 threw an error which read:
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> Could not open this file
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>
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> There is no command installed for 7-zip archive files. Do you want to search for a command to open this file?
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The error looked like this:
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### Reason ###
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Reason is quite evident from the error message itself. The 7Z, better to call it [7-zip][1], program is not installed and hence 7Z compressed files are not being extracted. This also hints that Ubuntu doesn’t support 7-Zip files by default.
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### Solution: Install 7zip in Ubuntu ###
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Solution is quite simple as well. Install the 7-Zip package in Ubuntu. Now you might wonder how to install 7Zip in Ubuntu? Well, in the previous error dialogue box if you click on “Search Command”, it will look for available p7zip package. Just click on “Install” here:
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### Alternative: Install 7zip in terminal ###
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If you prefer terminal, you can install 7zip in terminal using the following command:
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sudo apt-get install p7zip-full
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Note: You’ll find three 7zip packages in Ubuntu: p7zip, p7zip-full and p7zip-rar. The difference between p7zip and p7zip-full is that p7zip is a lighter version providing support only for .7z and .7za files while the full version provides support for more 7z compression algorithms (for audio files etc). For p7zip-rar, it provides support for .rar files along with 7z.
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In fact similar error can be encountered with [RAR files in Ubuntu][2]. Solution is the same, install the correct program.
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I hope this quick post helped you to solve the mystery of **how to open 7zip in Ubuntu 14.04**. Any questions or suggestions are always welcomed.
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/fix-there-is-no-command-installed-for-7-zip-archive-files/
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作者：[Abhishek][a]
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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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:http://www.7-zip.org/
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[2]:http://itsfoss.com/fix-there-is-no-command-installed-for-rar-archive-files/
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如何修复：There is no command installed for 7-zip archive files
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================================================================================
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### 问题 ###
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我试着在Ubuntu中安装Emerald图标主题，而这个主题被打包成了.7z归档包。和以往一样，我试着通过在GUI中右击并选择“提取到这里”来将它解压缩。但是Ubuntu 15.04却并没有解压文件，取而代之的，却是丢给了我一个下面这样的错误信息：
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> Could not open this file
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> 无法打开该文件
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>
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> There is no command installed for 7-zip archive files. Do you want to search for a command to open this file?
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> 没有安装用于7-zip归档文件的命令。你是否想要搜索命令来打开该文件？
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错误信息看上去是这样的：
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### 原因 ###
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发生该错误的原因从错误信息本身来看就十分明了。7Z，称之为[7-zip][1]更好，该程序没有安装，因此7Z压缩文件就无法解压缩。这也暗示着Ubuntu默认不支持7-zip文件。
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### 解决方案：在Ubuntu中安装 7zip ###
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要解决该问题也十分简单，在Ubuntu中安装7-Zip包即可。现在，你也许想知道如何在Ubuntu中安装 7Zip吧？好吧，在前面的错误对话框中，如果你右击“Search Command”搜索命令，它会查找可用的 p7zip 包。只要点击“Install”安装，如下图：
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### 可选方案：在终端中安装 7Zip ###
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如果偏好使用终端，你可以使用以下命令在终端中安装 7zip：
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sudo apt-get install p7zip-full
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注意：在Ubuntu中，你会发现有3个7zip包：p7zip，p7zip-full 和 p7zip-rar。p7zip和p7zip-full的区别在于，p7zip是一个更轻量化的版本，仅仅提供了对 .7z 和 .7za 文件的支持，而完整版则提供了对更多（用于音频文件等的） 7z 压缩算法的支持。对于 p7zip-rar，它除了对 7z 文件的支持外，也提供了对 .rar 文件的支持。
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事实上，相同的错误也会发生在[Ubuntu中的RAR文件][2]身上。解决方案也一样，安装正确的程序即可。
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希望这篇快文帮助你解决了**Ubuntu 14.04中如何打开 7zip**的谜团。如有任何问题或建议，我们将无任欢迎。
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--------------------------------------------------------------------------------
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via: http://itsfoss.com/fix-there-is-no-command-installed-for-7-zip-archive-files/
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作者：[Abhishek][a]
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译者：[GOLinux](https://github.com/GOLinux)
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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) 原创翻译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://itsfoss.com/author/abhishek/
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[1]:http://www.7-zip.org/
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[2]:http://itsfoss.com/fix-there-is-no-command-installed-for-rar-archive-files/
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