WSL 环境编译依赖 OpenSSL 的包遇到报错。第一个报错通过 sudo apt-get install pkg-config 解决了，后面依然提示找不到 openssl，但执行 openssl version 可以看到系统里已经安装了。

之后执行 sudo apt-get install libssl-dev 和 sudo apt-get update 遇到很多 404 Not Found 错误。

猜想是不是版本太老了，都打开 Microsoft Store 准备重装 WSL 了，在描述里看到

To keep your Debian environment up-to-date please use the following commands:

$ sudo apt update $ sudo apt dist-upgrade

依次执行：

1. sudo apt update
2. sudo apt-get update
3. sudo apt-get install libssl-dev

问题解决。

其他问题的解决可以看这里：在 WSL 中安装 Rust 交叉编译环境和报错解决

初始报错信息：

run pkg_config fail: `"pkg-config" "--libs" "--cflags" "openssl"` did not exit successfully: exit status: 1
error: could not find system library 'openssl' required by the 'openssl-sys' crate

--- stderr
Package openssl was not found in the pkg-config search path.
Perhaps you should add the directory containing `openssl.pc'
to the PKG_CONFIG_PATH environment variable
No package 'openssl' found

--- stderr
thread 'main' panicked at '

Could not find directory of OpenSSL installation, and this `-sys` crate cannot
proceed without this knowledge. If OpenSSL is installed and this crate had
trouble finding it,  you can set the `OPENSSL_DIR` environment variable for the
compilation process.

Make sure you also have the development packages of openssl installed.
For example, `libssl-dev` on Ubuntu or `openssl-devel` on Fedora.

If you're in a situation where you think the directory *should* be found
automatically, please open a bug at https://github.com/sfackler/rust-openssl
and include information about your system as well as this message.

$HOST = x86_64-unknown-linux-gnu
$TARGET = x86_64-unknown-linux-gnu
openssl-sys = 0.9.84