cygwinをインストールしたのですがcygwin/Xが起動しません。

ログを貼っておきます。
何が原因なのでしょうか？

Vendor: The Cygwin/X Project
Release: 6.8.2.0-2

Contact: cygwin-xfree@cygwin.com

XWin was started with the following command line:

XWin -multiwindow -clipboard -silent-dup-error

ddxProcessArgument - Initializing default screens
winInitializeDefaultScreens - w 1280 h 1024
winInitializeDefaultScreens - Returning
_XSERVTransSocketCreateListener: listen() failed
_XSERVTransSocketINETCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for inet
_XSERVTransmkdir: Cannot create /tmp/.X11-unix with root ownership
_XSERVTransSocketCreateListener: listen() failed
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for local

Fatal server error:
Cannot establish any listening sockets - Make sure an X server isn't already run
ning
winDeinitMultiWindowWM - Noting shutdown in progress