On Windows, default terminal for Atom\'s Platformio-Ide-Terminal is Powershell (at least, that is what I get without any configuration).
I would prefer a terminal using
If you are now using Ubuntu for Windows 10 (downloaded from the app store), you can change it to that as well.
Ubuntu gets installed in Windows' PATH by default, so just change the default shell to:
ubuntu.exe
That's it. Just remember that to get to your code, cd to /mnt/(driveletter)/wherever/your/files/sit.