I'm using ubuntu 20.04 LTS in windows 10

   G N U P L O T    Version 5.2 patchlevel 8    last modified 2019-12-01    Copyright (C) 1986-1993, 1998, 2004, 2007-2019    Thomas Williams, Colin Kelley and many others    gnuplot home:     http://www.gnuplot.info    faq, bugs, etc:   type "help FAQ"    immediate help:   type "help"  (plot window: hit 'h')Terminal type is now 'wxt'gnuplot> plot sin(x)Unable to init server: Could not connect: Connection refused19:59:45: Error: Unable to initialize GTK+, is DISPLAY set properly?Failed to initialize wxWidgets.Terminal type is now 'unknown'     wxt init failuregnuplot>