I am using Windows Ubuntu Subsystem 18.04. The command I run is
mv venv ../d/
and the folder can neither be found in current directory nor in d. This command is double checked from .bash_history. And, venv is a folder, d is a link to /mnt/d/ubuntu1804/ of my drive D in windows.
Also, I run command
mv a.txt ../d/
It works fine and the file can be found in d.
The current working directory is c which is a link of /mnt/c/ubuntu1804/.
Actually, the files are moved to the root of c drive named with d.