checkout directory failed on Ubuntu on Windows

[cybertk]

i.e. ckdots checkout .gnupg will create a symbolic link to /path/to/.gnupg.

Without the leading "/", Ubuntu does not treat it as a correct directory.

The right behavior should be creating a link to /path/to/.gnupg/ instead.

[cybertk]

ckdot checkout .gnupg/ is a workaround.