2020年4月23日，今天Windows 上的 Ubuntu 20.04 允許使用 Ubuntu Terminal 并運行 Ubuntu 命令行實用程序，包括 bash、ssh、git、apt 等。它要求 Windows 10 版本 16215.0 或更高版本，支持 ARM64 和 x64 體系結構。要注意的是，該程序在 Windows 10 S 上不受支持。
升級方法：
我這里只針對已有ubuntu的用戶
打開ubuntu 或 Windows Terminal，運行命令do-release-upgrade。
frank@LAPTOP-0OCJTGJR:~$ do-release-upgrade
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS develoment release
set Prompt=normal in /etc/update-manager/release-upgrades.
可能會出現上面的報錯信息。
打開文件sudo vi /etc/update-manager/release-upgrades
# Default behavior for the release upgrader.
[DEFAULT]
# Default prompting behavior, valid options:
#
# never - Never check for, or allow upgrading to, a new release.
# normal - Check to see if a new release is available. If more than one new
# release is found, the release upgrader will attempt to upgrade to
# the supported release that immediately succeeds the
# currently-running release.
# lts - Check to see if a new LTS release is available. The upgrader
# will attempt to upgrade to the first LTS release available after
# the currently-running one. Note that if this option is used and
# the currently-running release is not itself an LTS release the
# upgrader will assume prompt was meant to be normal.
#Prompt=lts
Prompt=normal
默認設置時Prompt=lts，將其改為Prompt=normal.，重新執行命令do-release-upgrade
期間會有兩次人工參與
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Do you want to start the upgrade?
40 packages are going to be removed. 424 new packages are going to be
installed. 690 packages are going to be upgraded.
You have to download a total of 547 M. This download will take about
6 minutes with your connection.
Installing the upgrade can take several hours. Once the download has
finished, the process cannot be canceled.
Continue [yN] Details [d]y
大概需要30'+的時間可以完成整個升級過程。
相關連接
Windows Subsystem for Linux（WSL）文件系統改進
第41章——從 Windows 命令行運行 Linux 工具
第42章——從 WSL 運行 Windows 工具
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