No, not the way you are thinking about. The current installer won't do it for you. It can be done after the install, but you will have to do it manually, the old fashioned way.is it possible to set up a encrypted LVM during Linux Mint 6 setup and install the OS on it...
I would suggest you look at TrueCrypt. It is open source and peer reviewed. I think it is one of the best encryption routines out there for Linux.
Fred