在 Mac 上，由于我曾经node运行过 NodeJS，所以我假设我在 Ubuntu 上也会做同样的事情（就像gccGNU C 编译器一样）。
于是我输入node，结果显示
The program 'node' can be found in the following packages:
* node
* nodejs-legacy
Try: sudo apt-get install <selected package>
看起来确实如此node。
但是如果我使用apt-cache search ^node$搜索其描述，它什么都不显示。如果我使用apt-cache search ^nodejs$，那么它会显示nodejs - evented I/O for V8 javascript。
看起来确实如此nodejs。
（此外，apt-cache show node没有显示任何内容，而apt-cache show nodejs显示了很多信息，所以似乎更有可能是nodejs。但是，当我输入时node，它说“可以在以下包中找到程序‘node’：node，nodejs-legacy”？）
在这种情况下，你怎么知道哪一个是正确的呢？我对知道哪一个是正确的不太感兴趣，但我更感兴趣的是学习如何从目前给出的信息中找出答案。
-- 更新：
根据 @muru 的要求，这是来自
$ sudo apt-get update
Hit http://us.archive.ubuntu.com wily InRelease
Hit http://us.archive.ubuntu.com wily-updates InRelease
Hit http://security.ubuntu.com wily-security InRelease
Hit http://us.archive.ubuntu.com wily-backports InRelease
Hit http://us.archive.ubuntu.com wily/main Sources
Hit http://security.ubuntu.com wily-security/main Sources
Hit http://us.archive.ubuntu.com wily/restricted Sources
Hit http://security.ubuntu.com wily-security/restricted Sources
Hit http://us.archive.ubuntu.com wily/universe Sources
Hit http://us.archive.ubuntu.com wily/multiverse Sources
Hit http://security.ubuntu.com wily-security/universe Sources
Hit http://us.archive.ubuntu.com wily/main amd64 Packages
Hit http://us.archive.ubuntu.com wily/restricted amd64 Packages
Hit http://security.ubuntu.com wily-security/multiverse Sources
Hit http://us.archive.ubuntu.com wily/universe amd64 Packages
Hit http://security.ubuntu.com wily-security/main amd64 Packages
Hit http://us.archive.ubuntu.com wily/multiverse amd64 Packages
Hit http://us.archive.ubuntu.com wily/main i386 Packages
Hit http://security.ubuntu.com wily-security/restricted amd64 Packages
Hit http://us.archive.ubuntu.com wily/restricted i386 Packages
Hit http://us.archive.ubuntu.com wily/universe i386 Packages
Hit http://security.ubuntu.com wily-security/universe amd64 Packages
Hit http://us.archive.ubuntu.com wily/multiverse i386 Packages
Hit http://us.archive.ubuntu.com wily/main Translation-en
Hit http://security.ubuntu.com wily-security/multiverse amd64 Packages
Hit http://us.archive.ubuntu.com wily/multiverse Translation-en
Hit http://security.ubuntu.com wily-security/main i386 Packages
Hit http://us.archive.ubuntu.com wily/restricted Translation-en
Hit http://security.ubuntu.com wily-security/restricted i386 Packages
Hit http://us.archive.ubuntu.com wily/universe Translation-en
Hit http://security.ubuntu.com wily-security/universe i386 Packages
Hit http://us.archive.ubuntu.com wily-updates/main Sources
Hit http://us.archive.ubuntu.com wily-updates/restricted Sources
Hit http://security.ubuntu.com wily-security/multiverse i386 Packages
Hit http://us.archive.ubuntu.com wily-updates/universe Sources
Hit http://us.archive.ubuntu.com wily-updates/multiverse Sources
Hit http://security.ubuntu.com wily-security/main Translation-en
Hit http://us.archive.ubuntu.com wily-updates/main amd64 Packages
Hit http://security.ubuntu.com wily-security/multiverse Translation-en
Hit http://us.archive.ubuntu.com wily-updates/restricted amd64 Packages
Hit http://us.archive.ubuntu.com wily-updates/universe amd64 Packages
Hit http://security.ubuntu.com wily-security/restricted Translation-en
Hit http://us.archive.ubuntu.com wily-updates/multiverse amd64 Packages
Hit http://us.archive.ubuntu.com wily-updates/main i386 Packages
Hit http://security.ubuntu.com wily-security/universe Translation-en
Hit http://us.archive.ubuntu.com wily-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com wily-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com wily-updates/multiverse i386 Packages
Hit http://us.archive.ubuntu.com wily-updates/main Translation-en
Hit http://us.archive.ubuntu.com wily-updates/multiverse Translation-en
Hit http://us.archive.ubuntu.com wily-updates/restricted Translation-en
Hit http://us.archive.ubuntu.com wily-updates/universe Translation-en
Hit http://us.archive.ubuntu.com wily-backports/main Sources
Hit http://us.archive.ubuntu.com wily-backports/restricted Sources
Hit http://us.archive.ubuntu.com wily-backports/universe Sources
Hit http://us.archive.ubuntu.com wily-backports/multiverse Sources
Hit http://us.archive.ubuntu.com wily-backports/main amd64 Packages
Hit http://us.archive.ubuntu.com wily-backports/restricted amd64 Packages
Hit http://us.archive.ubuntu.com wily-backports/universe amd64 Packages
Hit http://us.archive.ubuntu.com wily-backports/multiverse amd64 Packages
Hit http://us.archive.ubuntu.com wily-backports/main i386 Packages
Hit http://us.archive.ubuntu.com wily-backports/restricted i386 Packages
Hit http://us.archive.ubuntu.com wily-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com wily-backports/multiverse i386 Packages
Hit http://us.archive.ubuntu.com wily-backports/main Translation-en
Hit http://us.archive.ubuntu.com wily-backports/multiverse Translation-en
Hit http://us.archive.ubuntu.com wily-backports/restricted Translation-en
Hit http://us.archive.ubuntu.com wily-backports/universe Translation-en
Reading package lists... Done
$ apt-cache show node | grep -i Desc
$ # <-- nothing is showing up as result
$ apt-cache show node
N: Can't select versions from package 'node' as it is purely virtual
N: No packages found
答案1
从数字海洋：
要在 Ubuntu 上安装node，请执行以下操作：
更新您当前的软件包：
sudo apt-get update添加源（对于较新的版本，node 也建议从这里下载）：
wget -c https://deb.nodesource.com/setup | sudo bash -安装
node.js：sudo apt-get install nodejs您可能还需要
build-essential更多功能（npm 所需）：sudo apt-get install build-essential
答案2
跑步apt-cache show 应该显示他们的描述：
$ apt-cache show node | grep -i Desc
Description: Amateur Packet Radio Node program (transitional package)
Description-md5: 1278ed271672fd829c99361f93f468da
$ apt-cache show nodejs | grep -i Desc
Description: evented I/O for V8 javascript
Description-md5: e507fb472d7cdaceffc5b285a62d5c1b
如果没有，你仍然可以访问软件包索引。只需前往http://packages.ubuntu.com/<package-name>：
如您所见，在两个页面中，包的名称旁边都有描述。