Windows Store will often not open due to various reasons, this time we can try to download and install directly WSL
1. PowerShell in running Downloads:
PS C:\WINDOWS\system32> Invoke-WebRequest -Uri https://aka.ms/wsl-ubuntu-1804 -OutFile ./Ubuntu.appx -UseBasicParsing
2. Replace the suffix zip, unzip run ubuntu.exe can be installed in the current directory
3. After the PS can enter the input wsl