title: xfce4-session "cannot connect display" error
body: <p>I'm trying to run xubuntu-desktop on WSL as per the tutorial given by many sites. But I can't seem to connect to the display of VcXsrv and it always shows:</p>
  
  <pre><code>xfce4-session: Cannot open display: .
  Type 'xfce4-session --help' for usage.
  </code></pre>
  
  <p>If I run startxfce4, it says:</p>
  
  <pre><code>/usr/bin/startxfce4: X server already running on display muhammadsalmanafzal:0.0
  xrdb: Connection refused
  xrdb: Can't open display 'muhammadsalmanafzal:0.0'
  xfce4-session: Cannot open display: .
  Type 'xfce4-session --help' for usage.
  </code></pre>
  
  <p>Although, the VcXsrv window of Xlaunch is closed.
  Can anybody help me look for the error? What am I doing wrong?
  Also, when I first installed xubuntu-desktop, at the very end it said:</p>
  
  <pre><code>Errors were encountered while processing:
   blueman
  E: Sub-process /usr/bin/dpkg returned an error code (1)
  </code></pre>
  
  <p>And then I read somewhere to remove it, so I did and reinstalled xubuntu-desktop and no error was given.</p>