If you have installed Ubuntu from the Windows Store, chances are you won’t find the Ubuntu installation folder on your Windows 10 PC under its regular place in %localappdata%lxss folder.

For WSL Ubuntu installations made through the Microsoft Store, the root directory can be accessed at the following location your Windows 10 PC:

%localappdata%PackagesCanonicalGroupLimited.UbuntuonWindows_...LocalStaterootfs

Cheers!