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 refused
19:59:45: Error: Unable to initialize GTK+, is DISPLAY set properly?
Failed to initialize wxWidgets.
Terminal type is now 'unknown'
wxt init failure
gnuplot>
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If you are using original WSL, see What's the easiest way to run GUI apps on Windows Subsystem for Linux as of 2018?. Otherwise Are there any limitations in working in Ubuntu in Windows Subsystem for Linux on Windows 10?. Alternatively, set the gnuplot terminal type to one of the may file-based types (png, eps etc.) and copy the resulting file to your Windows system to display it. – steeldriver Jun 08 '20 at 14:53