How to fix XOpenDisplay Failed

I have Windows 10. I installed Ubuntu and when I want to run root at the Ubuntu Prompt I get this error: PopupLogo, XOpenDisplay failed ------------------------------------------------------------ | Welcome to ROOT 6.18/02 https://root.cern | | (c) 1995-2019, The ROOT Team | | Built for linuxx8664gcc on Sep 05 2019, 00:50:00 | | From tag , 23 August 2019 | | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q' | ------------------------------------------------------------ root I have Xming installed on my desktop however I still get the above error. Is there a way to fix this easily? I think this is effecting how I use ROOT. For example when I want to create a simple histogram (from an exponential function), everything runs fine to the next line but I do not get a histogram graph out. I do not think there is anything wrong with the code since I got it from a user manual and root doesn't show any errors but it just does show the histogram. Thanks!