You can do that. FDE commonly means an encrypted partition even though that's not what the name implies. It's never truly full disk as you have to have an unencrypted partition for the boot loader. There's also no restriction on having other unencrypted partitions. I've had this set up this way since Mint 14. I'm not sure why you're having an issue. You just set this up when you're creating your partitions (manually).
I have three main partitions: the unencrypted /boot partition, a LUKS encrypted partition that contains my / partition, and an unencrypted NTFS partition for Windows. Works like a charm.
The way to do it is to run `sudo apt-get update && sudo apt-get dist-upgrade` (or `apt-get upgrade`) before running the installer when you're in the live environment. There's a newer version of the installer in the repositories that has the option for FDE. I can't speak for Mint 15 because I didn't do a fresh install, just did an upgrade and never saw the installer. I expect it'll be something similar, or perhaps included by default.
I have three main partitions: the unencrypted /boot partition, a LUKS encrypted partition that contains my / partition, and an unencrypted NTFS partition for Windows. Works like a charm.
The way to do it is to run `sudo apt-get update && sudo apt-get dist-upgrade` (or `apt-get upgrade`) before running the installer when you're in the live environment. There's a newer version of the installer in the repositories that has the option for FDE. I can't speak for Mint 15 because I didn't do a fresh install, just did an upgrade and never saw the installer. I expect it'll be something similar, or perhaps included by default.