Describe the bug
After this:

There was E:\wsl\ext4.vhdx
When I issued wsl, a window flashed out and I could not get into ubuntu.
I issued wsl --list --verbose and could find ubuntu, but its state was "stop".
Then I try wsl --unregister Ubuntu
Now wsl --list shows nothing, but E:\wsl\ext4.vhdx is still there.
How can I use the E:\wsl\ext4.vhdx? I have important files in that ubuntu distro
In pwsh.exe:
PS C:\Users\MeMeMe> wsl --import Ubuntu E:\wsl E:\wsl\ext4.vhdx
The process cannot access the file because it is being used by another process