File saved in MS Windows has different font when opened in Ubuntu 12.04

I have a large file - a formula booklet with all the equations in Linux Libertine G (mostly italic) and saved in MS Windows. When this file is opened in Ubuntu 12.04 the equation font has been changed to Linux Libertine O (mostly regular) The result is very hard to read. I understand that this may be a bug. Is there any way to preserve the look of the equations using Linux Libertine or will I have to go back to Times New Roman?