blocks|key|6101764|text|通过强制curl和apt使用ipv4，可以正确解析download.docker.com。在curl中，添加-4参数|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|6101765|+Add+Docker’s+official+GPG+key:
$+curl+-4fsSL+https://download.docker.com/linux/ubuntu/gpg+%7C+sudo+apt-key+add+-|code-block|syntax|javascript|6101766|然后强制apt使用ipv4+=>+https://www.vultr.com/docs/force-apt-get-to-ipv4-or-ipv6-on-ubuntu-or-debian|6101767|entityMap|0|LINK|mutability|MUTABLE|url|https://www.vultr.com/docs/force-apt-get-to-ipv4-or-ipv6-on-ubuntu-or-debian^0|P|J|1I|2|0|0|H|24|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|10|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|11|8|@]|E|@$9|12|A|13|1|14]]|F|$]]|$1|N|3|-4|5|6|7|15|8|@]|E|@]|F|$]]]|O|$P|$5|Q|R|S|F|$T|U]]]]

By forcing curl and apt to use ipv4, <code>download.docker.com</code> is resolved correctly.
in curl, add the -4 argument

<pre><code> Add Docker’s official GPG key:
$ curl -4fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
</code></pre>

then to force apt to use ipv4 => <a href="https://www.vultr.com/docs/force-apt-get-to-ipv4-or-ipv6-on-ubuntu-or-debian" rel="noreferrer">https://www.vultr.com/docs/force-apt-get-to-ipv4-or-ipv6-on-ubuntu-or-debian</a>

blocks|key|1907507|text|这只是一个随机错误(可能是由于Internet不稳定、DNS缓存...)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1907508|在我的例子中，只需在我的浏览器中打开"https://download.docker.com/“(以确保互联网正常工作并且docker网站已打开)就解决了问题|offset|length|1907509|entityMap|0|LINK|mutability|MUTABLE|url|https://download.docker.com/^0|0|J|S|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

It's just a random error (may happens due to instable Internet, DNS caching ...)

In my case just opening "<a href="https://download.docker.com/" rel="noreferrer">https://download.docker.com/</a>" in my browser (to make sure Internet is working and the docker website is up) resolved the problem

blocks|key|2574966|text|如果问题仍然存在，则将您的DNS服务器更改/添加到google+DNS服务器:+8.8.8.8,8.8.4.4|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2574967|在更改DNS服务器之前，您可以尝试执行以下命令：|2574968|电子邮箱:+dig+@8.8.8.8+download.docker.com|2574969|dig+@8.8.4.4+download.docker.com|2574970|如果你是在ubuntu上，那么尝试下面的链接来改变DNS服务器：https://askubuntu.com/a/820873/707990|offset|length|2574971|entityMap|0|LINK|mutability|MUTABLE|url|https://askubuntu.com/a/820873/707990^0|0|0|0|0|W|11|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

If the problem persists, then change/add your DNS server to google DNS servers : 8.8.8.8,8.8.4.4

You can try the below commands before changing your DNS server :

dig @8.8.8.8 download.docker.com

dig @8.8.4.4 download.docker.com

If you are on ubuntu, then try the below link to change the DNS server :
<a href="https://askubuntu.com/a/820873/707990">https://askubuntu.com/a/820873/707990</a>

blocks|key|6101784|text|在我的例子中，断开与VPN的连接解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6101785|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case disconnecting from VPN solved the problem.

blocks|key|4688872|text|您需要在ubuntu中设置代理。这对我很有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4688873|export+https_proxy=<YOUR_PROXY_ADDRESS:PORT>|code-block|syntax|javascript|4688874|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You need to set proxy in ubuntu. It workd for me.

<pre><code>export https_proxy=&lt;YOUR_PROXY_ADDRESS:PORT&gt;
</code></pre>

blocks|key|4688909|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4688910|添加-4有助于解决这个问题，但是，我得到了另一个错误：|ordered-list-item|4688911|4688912|curl+-4fsSL+https://download.docker.com/linux/ubuntu/gpg+%7C+sudo+apt-key+add+-|offset|length|4688913|gpg:无法连接到代理:+IPC连接调用失败buntu1.1)|4688914|然后我遵循了这个答案：How+to+connect+to+the+agent:+IPC+connect+call，|4688915|。|4688916|4688917|它起作用了：|4688918|curl+-4fsSL+https://download.docker.com/linux/ubuntu/gpg+%7C+sudo+apt-key+add+-|4688919|好的|4688920|然而，我得到了W:无法从sudo+apt-get+update中获取解决'download.docker.com‘错误的https://download.docker.com/linux/ubuntu/dists/focal/InRelease临时故障|4688921|4688922|最后一个问题已通过运行以下命令解决：|4688923|4688924|echo+"nameserver+8.8.8.8“%7C+sudo+tee+/etc/resolv.conf+>+/dev/null|4688925|entityMap|0|LINK|mutability|MUTABLE|url|https://download.docker.com/linux/ubuntu/gpg|1|https://stackoverflow.com/questions/61463220/how-to-connect-to-the-agent-ipc-connect-call|2|3|https://download.docker.com/linux/ubuntu/dists/focal/InRelease^0|0|0|0|C|18|0|0|0|B|19|1|0|0|0|0|C|18|2|0|0|1O|1Q|3|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|1G|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|1H|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|1I|7|@]|8|@]|9|$]]|$1|E|3|F|4|5|6|1J|7|@]|8|@$G|1K|H|1L|1|1M]]|9|$]]|$1|I|3|J|4|5|6|1N|7|@]|8|@]|9|$]]|$1|K|3|L|4|5|6|1O|7|@]|8|@$G|1P|H|1Q|1|1R]]|9|$]]|$1|M|3|N|4|C|6|1S|7|@]|8|@]|9|$]]|$1|O|3|-4|4|5|6|1T|7|@]|8|@]|9|$]]|$1|P|3|Q|4|5|6|1U|7|@]|8|@]|9|$]]|$1|R|3|S|4|5|6|1V|7|@]|8|@$G|1W|H|1X|1|1Y]]|9|$]]|$1|T|3|U|4|5|6|1Z|7|@]|8|@]|9|$]]|$1|V|3|W|4|5|6|20|7|@]|8|@$G|21|H|22|1|23]]|9|$]]|$1|X|3|-4|4|5|6|24|7|@]|8|@]|9|$]]|$1|Y|3|Z|4|C|6|25|7|@]|8|@]|9|$]]|$1|10|3|-4|4|5|6|26|7|@]|8|@]|9|$]]|$1|11|3|12|4|5|6|27|7|@]|8|@]|9|$]]|$1|13|3|-4|4|5|6|28|7|@]|8|@]|9|$]]]|14|$15|$4|16|17|18|9|$19|1A]]|1B|$4|16|17|18|9|$19|1C]]|1D|$4|16|17|18|9|$19|1A]]|1E|$4|16|17|18|9|$19|1F]]]]

<ol>
<li>Adding -4 helped to resolve the issue, however, I got another error:</li>
</ol>
curl -4fsSL <a href="https://download.docker.com/linux/ubuntu/gpg" rel="nofollow noreferrer">https://download.docker.com/linux/ubuntu/gpg</a> | sudo apt-key add -
gpg: can't connect to the agent: IPC connect call failedbuntu1.1)
<ol start="2">
<li>Then I followed this answer: <a href="https://stackoverflow.com/questions/61463220/how-to-connect-to-the-agent-ipc-connect-call">How to connect to the agent: IPC connect call</a></li>
</ol>
and it worked:
curl -4fsSL <a href="https://download.docker.com/linux/ubuntu/gpg" rel="nofollow noreferrer">https://download.docker.com/linux/ubuntu/gpg</a> | sudo apt-key add -
OK
However, I got W: Failed to fetch <a href="https://download.docker.com/linux/ubuntu/dists/focal/InRelease" rel="nofollow noreferrer">https://download.docker.com/linux/ubuntu/dists/focal/InRelease</a> Temporary failure resolving 'download.docker.com' error from sudo apt-get update
<ol start="3">
<li>The last issue got resolved by running:</li>
</ol>
echo &quot;nameserver 8.8.8.8&quot; | sudo tee /etc/resolv.conf &gt; /dev/null

blocks|key|1907600|text|手动添加GPG密钥|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1907601|如果不起作用，请单击链接下载gpg密钥，然后手动添加|1907602|sudo+apt-key+add+'/home/qxx2598/Downloads/gpg'+|code-block|syntax|javascript|1907603|entityMap^0|0|9|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Manually Add GPG Key
If that does not work than click on the link to download gpg key and then manually add it
<pre><code>sudo apt-key add '/home/qxx2598/Downloads/gpg' 
</code></pre>

I am getting this error while installing docker CE on my <code>ubuntu</code> machine

<pre><code>curl: (6) Could not resolve host: download.docker.com
gpg: no valid OpenPGP data found.
</code></pre>

While performing the step

<pre><code>Add Docker’s official GPG key:
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
</code></pre>

as mentioned here <a href="https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/#install-docker-ce-1" rel="noreferrer">https://docs.docker.com/engine/installation/linux/docker-ce/ubuntu/#install-docker-ce-1</a>

"Could not resolve host: download.docker.com" while installing docker CE

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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在ubuntu计算机上安装docker CE时出现此错误curl: (6) Could not resolve host: download.docker.comgpg: no valid OpenPGP data found.在执行该步骤时Add Docker’s official GPG key:$ curl -fsSL https://download.docker.com/linux/ub

问安装docker CE时出现“无法解析主机: download.docker.com”
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