Update README.md

Added troubleshooting instructions for ubuntu installations without python-appindicator.

README.md

@@ -57,6 +57,13 @@ need to clear the pip cache before upgrading:
 3. Remembers which links you opened
 4. Shows Points/Comment count in a simple format
 
+###Troubleshooting
+
+If the app indicator fails to show in Ubuntu versions, consider installing 
+python-appindicator with
+
+`sudo apt-get install python-appindicator`
+
 ##Author Information
 - Abhay Rana (<me@captnemo.in>)