Add instructions

Author: garrettmflynn

README.md

@@ -37,11 +37,15 @@ Run the `setup.exe` file and follow all instructions.
 
 Run the `.dmg` file and follow all instructions to move the file into your Applications folder.
 
-### Ubuntu - Graphical Interface
+### Ubuntu
+
+> **Note:** If you're running the `.AppImage` and the app window clears to a white screen within a few seconds of starting, you will need to follow the [Developer Instructions](#developer-installation) on the [linux-fix](https://github.com/neurodatawithoutborders/nwb-guide/tree/linux-fix) branch of the NWB GUIDE.
+
+#### Graphical Interface
 
 Right-click the `.AppImage` file, navigate to `permissions`, and check any box which mentions 'run as executable'.
 
-### Ubuntu - CLI
+#### Ubuntu - CLI
 
 From the terminal, simply type
 
@@ -57,6 +61,7 @@ Where you are using version `X.Y.Z`; then execute by calling
 
 
 
+
 ## Developer Installation
 
 Start by cloning the repository