Create ubuntu-tkinter.md

Author: ColinNorick

assign2/ubuntu-tkinter.md

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+# Tkinter Display Issue
+Some users have been running into a display issue on Windows installations running Python through Ubuntu bash. The issue happens because the software in the starter code for `requests` uses Python visualization features but, by default, Ubuntu bash is not configured to recognize that it's connected to a display that supports those features.
+
+In this guide, we'll install software that allows Ubuntu bash to communicate with the Windows operating system and use your computer's built-in display.
+
+## 1. Create a Virtual Display that Mirrors to the Actual Display
+We first need to create a way to communicate between Ubuntu bash and the default Windows operating system about the display setup. To create this, install [Xming X Server for Windows](https://sourceforge.net/projects/xming/) and, during the installation, set the display value to 0. This tells the server to host its virtual display mirror on "port" 0.
+
+## 2. Tell Ubuntu Bash to Use the Virtual Display
+Once that is set up, we need to tell Ubuntu bash to use the virtual display that we just configured. At a command line run:
+
+```
+$ export DISPLAY=:0
+```
+
+You'll need to do this every time you open up a terminal prompt, because the export settings get re-set when the terminal closes.
+
+## 3. Configure Permissions on the Display
+By default, Ubuntu bash will not allow programs to display things. To change that, we need to change the permissions on the display. Run the following lines of code:
+
+```
+$ sudo apt install x11-xserver-utils
+$ xhost +
+```
+
+After the first command, there will be some installation prompts. After the second, you should see a message that says something like `access control disabled, clients can connect from any host`.
+
+## 4. Run `visualizaton.py`
+Now, you should be able to execute:
+
+```
+$ python3 visualization.py
+```
+
+> With 🦄s by @psarin and @coopermj