在 Windows 10 上的 WSL 上安装 Turi Create 时出现问题

Question

我已经在 WSL 上为 Turi Create 安装了 Ubuntu，但是当我开始时：

sudo apt install python3-pip

...我得到错误：

Package python3-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source"

我该如何解决这个问题？

Answer 1

简短的回答：

sudo apt update

然后安装。

更多解释：

如果您尝试在 WSL 上安装 Ubuntu 后立即安装任何package，您将看到：

Package <package_name> is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

和/或：

E: Package '<package_name>' has no installation candidate

这是因为尚未填充 apt 缓存。 为了在 WSL 上下载和安装 Ubuntu 时节省带宽，默认情况下不会填充 package 列表。 WSL 上基于 apt 的发行版需要初始sudo apt update 。

但作为一般规则，在安装任何基于 Debian 的发行版之后，建议您首先执行sudo apt update 。 否则，由于缓存中的包和 URL 经常更改，您可能会遇到安装错误。

示例 - 从 WSL 上的全新 Ubuntu 安装：

> sudo apt install python3-pip
[sudo] password for ntd:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package python3-pip is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'python3-pip' has no installation candidate

> sudo apt update && sudo apt upgrade -y

... output trimmed

> sudo apt install python3-pip

... installs as expected