WSL2 There was only a steady way to get Ubuntu20.04 back to WSL1

Overview

I tried migrating Ubuntu 20.04 of WSL1, but I reverted to the original because of the following problems.

VS-Code Paste Image cannot be used The image cannot be pasted in README.md on WSL. Unable to convert images on the Windows clipboard to the Linux clipboard.

result

There was only a steady method. Therefore, when migrating to WSL2, I think it is better to export and try it in the newly created environment.

Failure ... Export WSL2 image and import as WSL1 → Import was successful but could not be started
Success ... Back up the files in WSL2, erase the image of WSL2, recreate the image of WSL1 and restore the files and packages

Procedure: If you did not export when migrating to WSL2

It is for reference only. I have recovered from the failed procedure, so I haven't actually tried it.

Open WSL Close Terminal, VS-Code and other editors, Explorer, etc.
wsl --export Ubuntu-20.04 ./Ubuntu.tar
wsl --import Ubuntu-20.04-WSL2 .\Ubuntu-20.04-WSL2 Ubuntu.tar --version 2
Reinsert Ubuntu-20.04 in WSL1
Migrate files from Ubuntu-20.04-WSL2 with tar

Reference: Failed procedure

Check the status

PS C:\wsl_migration> wsl -l --verbose
  NAME            STATE           VERSION
* Ubuntu-20.04    Running         2
PS C:\wsl_migration>

Close the terminal or VS-Code After closing, make sure it is Stopped

PS C:\wsl_migration> wsl -l --verbose
  NAME            STATE           VERSION
* Ubuntu-20.04    Stopped         2
PS C:\wsl_migration>

Export

PS C:\wsl_migration> wsl --export Ubuntu-20.04 ./Ubuntu.tar
  NAME            STATE           VERSION
* Ubuntu-20.04    Stopped         2
PS C:\wsl_migration>

Unregister Distribution

PS C:\wsl_migration> wsl --unregister Ubuntu-20.04

Unregistered... PS C:\wsl_migration> wsl -l --verbose The distribution is not installed on the Windows subsystem for Linux. The distribution visits the Microsoft Store and installs Can be: https://aka.ms/wslstore PS C:\wsl_migration> ```

Start PowerShell as an administrator and set the default version of WSL to 1.

PS C:\WINDOWS\system32> wsl --set-default-version 1
PS C:\WINDOWS\system32>

Reinstall Ubuntu-20.04 If there is a link in the Windows menu, you can click it or install it from the Store.

** Introducing **

```
PS C:\wsl_migration> wsl -l --verbose
  NAME            STATE           VERSION
  Ubuntu-20.04    Installing      1
PS C:\wsl_migration>
```

** Installation completed **

```
PS C:\wsl_migration> wsl -l --verbose
  NAME            STATE           VERSION
* Ubuntu-20.04    Running         1
PS C:\wsl_migration>
```

Import wsl --import <uncovered NAME> <Destination of LocalState (rootfs, etc.)> <Path of exported tar file> --version 1.

PS C:\wsl_migration> wsl --import Ubuntu-20.04-WSL1 C:\Users\RoboDev\AppData\Local\Packages\CanonicalGroupLimited.Ubuntu20.04onWindows Ubuntu.tar --version 1
PS C:\wsl_migration> wsl -l --verbose
  NAME                 STATE           VERSION
* Ubuntu-20.04-WSL1    Stopped         1
PS C:\wsl_migration>

Start Start with the following command or Windows Terminal. failed. failed. failed.
```
PS C:\wsl_migration> wsl -d Ubuntu-20.04-WSL1
```

Server execution failed PS C:\wsl_migration> ```

Start PowerShell as an administrator and recover The wsl -l --verbose command freezes, and unregister also terminates with an error, so recover.
```
PS C:\WINDOWS\system32> Disable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
```

Since a reboot was requested, execute the following command after the reboot.

```
PS C:\WINDOWS\system32> dism.exe /online /enable-feature /featurename:Microsoft-Windows-Subsystem-Linux /all /norestart
```

If Ubuntu remains in the application and function, delete it

```
PS C:\WINDOWS\system32> Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Windows-Subsystem-Linux
```

Delete it with wsl --unregister Ubuntu-20.04-WSL1.