Remember to terminate the WSL distribution first
wsl --export Ubuntu-20.04 "D:\Hyper-V\wsl\Ubuntu_20_04\Ubuntu_20_04.tar"
wsl --unregister Ubuntu-20.04
wsl --import Ubuntu-20.04 "D:\Hyper-V\wsl\Ubuntu_20_04" "D:\Hyper-V\wsl\Ubuntu_20_04\Ubuntu_20_04.tar" --version 2