Windows10+新安装WSL的root密码设置及文件复制

Windows10+上安装WSL时，经常可能会直接设置了一个普通用户和密码，但是在后继的工作过程中很可能会用到root账号。但由于安装过程中未设置过root账号的密码，切换不了root：

Installing, this may take a few minutes...
Please create a default UNIX user account. The username does not need to match your Windows username.
For more information visit: https://aka.ms/wslusers
Enter new UNIX username: xurm
New password:
Retype new password:
passwd: password updated successfully
Installation successful!
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

Welcome to Ubuntu 20.04.3 LTS (GNU/Linux 5.15.79.1-microsoft-standard-WSL2 x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

  System information as of Wed Feb 22 11:05:18 CST 2023

  System load:  0.11                Processes:             9
  Usage of /:   0.1% of 1006.85GB   Users logged in:       0
  Memory usage: 7%                  IPv4 address for eth0: 172.28.161.50
  Swap usage:   0%

1 update can be applied immediately.
To see these additional updates run: apt list --upgradable


The list of available updates is more than a week old.
To check for new updates run: sudo apt update


This message is shown once a day. To disable it please create the
/home/xurm/.hushlogin file.
xurm@xurm-pad:~$ su root
Password:
su: Authentication failure
xurm@xurm-pad:~$

　　当然你也可以按上面的提示使用"sudo <command>"执行你想执行的命令，但如果就是想切换到root账号做操作呢？这时需要重新设置一下root密码了：

xurm@xurm-pad:~$ sudo  passwd root
New password:
Retype new password:
passwd: password updated successfully
xurm@xurm-pad:~$ su root
Password:
root@xurm-pad:/home/xurm#

 　　最后提一下如何将Windows本地目录中的文件复制到WSL中，比如我本地E盘的master1.crt文件(E:\Dowloads\master1.crt)需要复制到WSL系统里的 /etc/docker/certs.d/master1/ 目录下：

[xurm@xurm-pad ~]$ pwd
/home/xurm
[xurm@xurm-pad ~]$ sudo mkdir -p /etc/docker/certs.d/master1/
[sudo] password for xurm:
[xurm@xurm-pad ~]$ ls /etc/docker/certs.d/master1/
[xurm@xurm-pad ~]$ cd /mnt
[xurm@xurm-pad mnt]$ ls 
c  d  e  wsl  wslg
[xurm@xurm-pad mnt]$ ls /mnt/e/Dowloads/
cert-manager.yaml                 jenkins.war                   master1.crt
[xurm@xurm-pad mnt]$ sudo cp /mnt/e/Dowloads/master1.crt /etc/docker/certs.d/master1/
[xurm@xurm-pad mnt]$ ls /etc/docker/certs.d/master1/
master1.crt
[xurm@xurm-pad mnt]$

　　注意红色标记的命令或目录！