entityMap|blocks|key|12q2q|text|windows:最简单最简单的方法是下载最新版本的flutter+sdk。手动替换当前文件夹，方法是粘贴下载的颤振文件夹，而不是C盘中的当前文件夹。始终选择替换和粘贴。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|7trco|在完成与颤动医生的检查之后。我的问题解决了^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|F|9|@]|A|@]|B|$]]]]

windows:
simplest and easiest way is download the latest version flutter sdk. replace manually current folder by pasting downloaded flutter folder instead of the current folder
in c drive. always choose replace and paste.

after finishing that check with flutter doctor. my issue solved

entityMap|blocks|key|88u76|text|我发现我的杀毒软件阻止了“酒吧升级”，我在点击“扑扑医生”时遇到了同样的问题，我关闭了我的杀毒软件，并再次尝试运行“扑动医生”，并且工作得很好！|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

I found my antivirus blocks <code>pub upgrade</code>,I had same issue while hitting <code>flutter doctor</code>, I turned off my antivirus and tried to run &quot;flutter doctor&quot; again, and worked well!

entityMap|blocks|key|ngr3|text|这个问题将在受保护的网络中出现，也会由于防病毒而出现。就连我也面临着同样的问题。我从下面的链接手动下载了最新的稳定版本，它不需要任何更新过程，目前有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|13shd|Zip格式的Flutter下载链接^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|F|9|@]|A|@]|B|$]]]]

This issue will come in protected network as well as due to anti-virus. Even I was facing the same. I downloaded latest stable version manually from the following link, which doesn't required any update process and it works for now..

<a href="https://flutter.dev/docs/development/tools/sdk/releases" rel="nofollow noreferrer">Download Link For Flutter in Zip format</a>

entityMap|blocks|key|6ub7o|text|确保你下载了windows+powershell我使用的windows8它不是默认安装的，当我下载它的时候，它对我来说是有效的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

Make sure you downloaded the windows powershell i use windows 8 it wasn't installed by default , when i downloaded it it worked for me.

entityMap|blocks|key|f4vbe|text|首先确保您的互联网连接正常，如果此问题仍然存在，则此错误可能是因为未正确下载dart+sdk。最简单的解决方案是删除|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39f0v|位于以下位置的文件夹|8ulkf|(安装flutter的位置)，然后运行^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|G|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|H|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|I|9|@]|A|@]|B|$]]]]

First Make sure you have a working internet connection and if this issue still exists then, this error may be because the dart sdk may have not been properly downloaded.
The simplest solution is to delete the <code>cache</code> folder located in
<code>flutter/bin</code>(location where flutter is installed) and then Run <code>flutter doctor</code>

entityMap|blocks|key|c2p7q|text|检查环境变量(用户变量)中的颤振箱路径。如果没有，请转到用户变量下，检查是否存在名为path+:条目，在其中添加此颤动/绑定路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

Check your flutter bin path in environment variable(User Variables). If not go to Under User variables check if there is an entry called Path:in that add this flutter/bin path.

entityMap|blocks|key|a7e90|text|奇怪的是当我|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3rgue|在Windows任务管理器中终止dart进程|4mnlh|它正在工作。但有时甚至当dart进程正在运行时，更新工作。^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|G|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|H|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|I|9|@]|A|@]|B|$]]]]

Strangly when I kill the dart process in Windows Task Manager it is working. But sometimes even when dart process is running update working.

entityMap|blocks|key|cf0gv|text|只需删除flutter/bin中的缓存文件夹，然后运行|type|unstyled|depth|inlineStyleRanges|entityRanges|data|46gh8|再来一次！！^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|F|9|@]|A|@]|B|$]]]]

Just delete the cache folder in flutter/bin and run <code>flutter doctor</code> again!!

entityMap|blocks|key|e2a7e|text|我不得不关掉Android模拟器。它在为我奔跑..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

I had to turn off the Android Emulator. It was running for me...

entityMap|blocks|key|b2f31|text|我得到了同样的错误，并且无法摆脱它。所以我删除了flutter，而不是克隆它，我从flutter网站下载了zip并解压缩了它。现在它工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

I got the same error and was not able to get rid of it. So I deleted the flutter and instead of cloning it I downloaded the zip from the flutter website and extracted it. Now it works just fine.

entityMap|blocks|key|dd6h7|text|只要停用你的杀毒软件，然后再运行一次就行了。它会工作得很好。我以前也遇到过同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

Just Deactivate your antivirus and run it again. It would work fine. I had the same issue before.

entityMap|blocks|key|5krd7|text|从flutter网站手动下载SDK修复了该问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|7djht|仍然不知道为什么会发生这个问题。^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|F|9|@]|A|@]|B|$]]]]

Manually downloading the SDK from flutter website fixed the issue.
Still dont know why this problem occured tho.

entityMap|blocks|key|362up|text|我停用了一段时间的杀毒软件，并再次在cmd中执行了一次扑动医生命令，经过几个小时的耐心，我得到了丰硕的结果。还有一件事需要注意，您应该确保将dart-sdk文件夹的路径添加到用户变量的路径中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

I deactivated my antivirus for some time and executed flutter doctor command once again in cmd and got fruitful results after hours of patience.
One more thing to note, you should ensure that path of dart-sdk folder should be added to the path in user variables.

entityMap|blocks|key|fskmt|text|它似乎无法“解压缩”下载的Dart文件，因为它错过了7-zip解压。我安装了它，它起作用了！它将处理.7z文件。我希望它也适用于其他人！！|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|5|6|7|8|C|9|@]|A|@]|B|$]]]]

It seems it is not being able to &quot;unzip&quot; the downloaded Dart file because it misses 7-zip uncompressor.
I installed it and it worked! It will deal with .7z files.
I hope it works for other people too!!

entityMap|blocks|key|454u0|text|在我的例子中，在反病毒软件中将以下文件夹添加到排除选项后，错误会得到解决|type|unstyled|depth|inlineStyleRanges|entityRanges|data|609vh|Flutter+SDK位置|c8gpm|D:\Android\flutter|8h6oi|_|dfp5i|窗口\颤动|cmq74|*|7rjco|..。|g8kr|9930i|Flutter+Local+Pub文件夹|9un5g|C:\Users\hitesh\AppData\Local\Pub^0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|T|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|U|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|V|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|W|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|X|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|Y|9|@]|A|@]|B|$]]|$2|M|4|N|6|7|8|Z|9|@]|A|@]|B|$]]|$2|O|4|L|6|7|8|10|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|11|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|12|9|@]|A|@]|B|$]]]]

In my case, the error resolve after adding below folder into exclude option in anti virus
Flutter SDK location
<code>D:\Android\flutter_windows\flutter\*.</code>
Flutter Local Pub folder
<code>C:\Users\hitesh\AppData\Local\Pub</code>

entityMap|blocks|key|d09or|text|如果您正在使用Avast+|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|8b42c|ftgpp|(也可能是其他一些杀毒软件)，并且最近已将操作系统更新为Big+Sur，然后按照以下步骤修复此问题|91gck|打开Avast并在Web+Shield区域中禁用“Scan+secure+connection".|b34ue|5d16e|运行n+flutter+config+--no-analytics然后运行|4m9kd|+pub+upgrade.|3eeg6|..。|4s0j0|这可能会解决这个问题。|ih94|你也可以参考Github中的以下线程，了解更多关于原因的详细信息|9lig2|https://github.com/flutter/flutter/issues/40515|55tkv|https://github.com/flutter/flutter/issues/68999^0|7|5|0|0|0|P|M|0|0|4|T|0|1|B|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|10|9|@$A|11|B|12|C|D]]|E|@]|F|$]]|$2|G|4|-4|6|7|8|13|9|@]|E|@]|F|$]]|$2|H|4|I|6|7|8|14|9|@]|E|@]|F|$]]|$2|J|4|K|6|7|8|15|9|@$A|16|B|17|C|D]]|E|@]|F|$]]|$2|L|4|-4|6|7|8|18|9|@]|E|@]|F|$]]|$2|M|4|N|6|7|8|19|9|@$A|1A|B|1B|C|D]]|E|@]|F|$]]|$2|O|4|P|6|7|8|1C|9|@$A|1D|B|1E|C|D]]|E|@]|F|$]]|$2|Q|4|R|6|7|8|1F|9|@]|E|@]|F|$]]|$2|S|4|T|6|7|8|1G|9|@]|E|@]|F|$]]|$2|U|4|V|6|7|8|1H|9|@]|E|@]|F|$]]|$2|W|4|X|6|7|8|1I|9|@]|E|@]|F|$]]|$2|Y|4|Z|6|7|8|1J|9|@]|E|@]|F|$]]]]

If you are using <code>Avast</code> (or possibly some other anti virus too) on Mac and have recently updated the OS to Big Sur then follow the below steps to fix this issue
<ol>
<li>Open Avast and in the Web Shield area disable the &quot;<code>Scan secure connection</code>&quot;.</li>
<li>Run <code>flutter config --no-analytics</code> and then run <code>pub upgrade</code>.</li>
</ol>
This should probably fix the issue.
You can also refer to below threads in Github for more details about the cause
<a href="https://github.com/flutter/flutter/issues/40515" rel="nofollow noreferrer">https://github.com/flutter/flutter/issues/40515</a>
<a href="https://github.com/flutter/flutter/issues/68999" rel="nofollow noreferrer">https://github.com/flutter/flutter/issues/68999</a>

Log:
<blockquote>
E:\Flutter&gt;flutter doctor Checking Dart SDK version... Downloading
Dart SDK from Flutter engine ead227f a... Unzipping Dart SDK...
Updating flutter tool... Error: Unable to 'pub upgrade' flutter tool.
Retrying in five seconds...
Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub
upgrade' flutter tool. Retrying in five seconds...
Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub
upgrade' flutter tool. Retrying in five seconds...
Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub
upgrade' flutter tool. Retrying in five seconds...
Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub
upgrade' flutter tool. Retrying in five seconds...
Waiting for 0 seconds, press CTRL+C to quit ... Error: Unable to 'pub
upgrade' flutter tool. Retrying in five seconds...
</blockquote>
<a href="https://user-images.githubusercontent.com/7486205/37921034-427dc406-3146-11e8-8c7f-ddc1e66ca6ae.JPG" rel="noreferrer">Android studio log</a>

Error: Unable to 'pub upgrade' flutter tool. Retrying in five seconds

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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 日志： E:\Flutter>flutter医生正在检查Dart SDK版本...正在从Flutter engine ead227f下载Dart SDK...正在解压缩Dart SDK...正在更新颤动工具...错误:无法‘发布升级’颤动工具。五秒后重试... 正在等待0秒，请按CTRL+C退出...错误:无法‘发布...

问错误:无法‘发布升级’颤动工具。五秒后重试
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问错误:无法‘发布升级’颤动工具。五秒后重试EN