I'm in an interesting place. I have both Windows 8 and Ubuntu 13.04 installed on different partitions, both accessed through legacy boot. This machine came with UEFI by default. Anyway, the only way I can switch between the tow OSes is by changing which one has the "boot" flag from a Ubuntu live USB.
How can I install a boot manager after having the OSes already installed, where I can select which one I want to use when I turn my computer on?