Fix position and package name casing

Author: koppor

en/faq/linux.md

@@ -6,6 +6,12 @@ Yes, there is. See [http://askubuntu.com/a/721387/196423](http://askubuntu.com/a
 
 ## JabRef does not start under Linux! What can I do?
 
+### Wayland-based systems
+
+JabRef relies on [XWayland](https://wayland.freedesktop.org/docs/html/ch05.html) to run in Wayland environments.
+If your system is missing this dependency, the application will fail to launch (often showing an `Unable to open DISPLAY` error).
+To fix this, install `xwayland` using your distribution's package manager.
+
 ### JabRef 5.x
 
 JabRef comes with a bundled JRE. There is no need to install Java separately. Thus, there should be no issues at start up.
@@ -18,10 +24,6 @@ Please follow the steps provided on our [installation page](../installation.md).
 
 You might see the error message `Error: Could not find or load main class org.jabref.JabRefMain`. This means, you do not have [JavaFX](https://en.wikipedia.org/wiki/JavaFX) support activated in your Java runtime environment. This typically happens if you use [OpenJDK](http://openjdk.java.net/), where one needs to setup [OpenJFX](https://wiki.openjdk.java.net/display/OpenJFX/Main) separately.
 
-## Wayland-based systems
-
-JabRef relies on [XWayland](https://wayland.freedesktop.org/docs/html/ch05.html) to run in Wayland environments. If your system is missing this dependency, the application will fail to launch (often showing an `Unable to open DISPLAY` error). To fix this, simply install XWayland using your distribution's package manager.
-
 ## I am on Debian/Ubuntu and clicking on the JabRef icon works, but I cannot start JabRef from the command line. What is wrong?
 
 You have several Java Virtual Machines installed, and under the command line the wrong one is chosen. Have a look at the previous question that tells you how to change the virtual machine used.