I've installed Ubuntu 14.04.1 LTS on my Macbook Pro 15" with Retina Display with Parallels 10, and enabled Retina resolution. In order to scale up the GUI, I tried to change the settings in "Display" as described here: http://www.itworld.com/software/415502/scale-title-bars-and-menu-ubuntu-1404, but it doesn't change the appearance of Ubuntu at all. Using the "Tweak tool", I was able to scale up the font size, but the menu and title bar are still very small. Please let me know if anyone has a fix. Thanks a lot in advance!