-dragging with the LMB on one of the points, will translate the ruler line to another place on
-the video while maintaining its length and angle. If you dismiss the Ruler menu, click on
+dragging with the LMB on any of the points, will translate the ruler line to another place on
+the video while maintaining its length and angle. For some desktop window managers, such as
+\textit{UbuntuStudio 16.4} and \textit{Arch}, the Alt key is already in use by the Operating System
+so you will have to use Alt+Ctrl instead.
+If you dismiss the Ruler menu, click on