I have a dual-boot laptop with four partitions -
Ubuntu (OS) and
Ubuntu /home. I need to do full disk encryption on it. Ubuntu is running 12.04, Windows is Windows 7 Home Premium.
I don't see how to avoid to handle Windows and Ubuntu separately using software.
Alternatively, get yourself an expensive Self Encrypting Hard Drive unlocked by your BIOS at boot time, if supported. This way, no configuration is required by your OS and all processing (encrypting/decrypting) is done by the hard drive instead of your CPU.