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<p>I used this instruction
<a class="moz-txt-link-freetext" href="https://packagecloud.io/varnishcache/varnish60/install#manual-deb">https://packagecloud.io/varnishcache/varnish60/install#manual-deb</a></p>
<p>put to <span style="color: rgb(199, 37, 78); font-family: Menlo,
Monaco, Consolas, "Courier New", monospace; font-size:
16.2px; font-style: normal; font-variant-ligatures: normal;
font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; orphans: 2; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(249, 242, 244); text-decoration-style:
initial; text-decoration-color: initial; display: inline
!important; float: none;">/etc/apt/sources.list.d/varnishcache_varnish60.list</span>
</p>
<p>deb <a class="moz-txt-link-freetext" href="https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial">https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial</a>
16.04 LTS Xenial Xerus main<br>
deb-src
<a class="moz-txt-link-freetext" href="https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial">https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial</a> 16.04
LTS Xenial Xerus main<br>
</p>
<p>and when do sudo apt-get update got an error:</p>
<p>...</p>
<p>W: The repository
'<a class="moz-txt-link-freetext" href="https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial">https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial</a>
16.04 Release' does not have a Release file.<br>
N: Data from such a repository can't be authenticated and is
therefore potentially dangerous to use.<br>
N: See apt-secure(8) manpage for repository creation and user
configuration details.<br>
E: Failed to fetch
<a class="moz-txt-link-freetext" href="https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial/dists/16.04/LTS/source/Sources">https://packagecloud.io/varnishcache/varnish60/ubuntu/xenial/dists/16.04/LTS/source/Sources</a>
404 Not Found<br>
E: Some index files failed to download. They have been ignored, or
old ones used instead.<br>
neo@neo:/tmp/varnish-cache$</p>
<p><br>
</p>
<p>The whole code: <a class="moz-txt-link-freetext" href="https://paste.ubuntu.com/p/6FkQZbCPf6/">https://paste.ubuntu.com/p/6FkQZbCPf6/</a></p>
<p>How to install varnish6 ?<br>
</p>
<p><br>
</p>
<p><br>
</p>
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