Added Display section for troubleshooting

README.md

@@ -152,7 +152,34 @@ To verify if everything worked, try to open the STM32CubeMX. Execute the followi
 ```(cmd)
 stm32cubemx
 ```
-If it does not work you may have to play around with the DISPLAY environment variable.
+If it does not work you may have to play around with the DISPLAY environment variable. Check the following section.
+
+## Display 
+
+If you run into this issue, you can try this solution from https://stackoverflow.com/a/44434831
+
+```(cmd)
+echo $DISPLAY
+OUTPUT:
+:1
+```
+
+```(cmd)
+xauth list
+OUTPUT:
+<device>:1  MIT-MAGIC-COOKIE-1  <secret>
+```
+
+```(cmd)
+export DISPLAY=:1
+```
+
+```(cmd)
+xhost +local:docker
+OUTPUT:
+non-network local connections being added to access control list
+```
+Then return to Test the Setup section and check if everything is working correctly
 
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