Full disk encryption of Ubuntu for certain partitions at install time

[Sreyan Chakravarty]

I have two unencrypted partitions containing Windows 10. Now I want to
install Ubuntu 16.04 into the remaining free space that I have, with full
disk encryption ie. encrypted root, encrypted swap, and encrypted home.

And all of the above 3 needs to be in separate partitions.

I have got some hints from the following tutorial-:

http://www.hecticgeek.com/2012/10/how-to-setup-encrypted-ubuntu-installation/

But the problem is that the tutorial shows only how to add a single
encrypted partition and mount it as root (/). If I try the same technique
and try to create 3 partitions I get the problem that the installer creates
3 separate partition with 3 different encryption keys. That's not what I
want. *I want one key for all 3 partitions. *Also if I try to allocate one
encrypted volume I cannot split that volume into multiple other volumes to
make /, swap and /home.

Basically what I want is the "Encrypt this installation for security"
option for only the ubuntu partitions on my hdd.

This is even possible in Ubuntu 16.04 ? Because it is very possible in the
new Fedora.

Need help, and if this feature is not present in the Ubuntu installer at
this point, would be great if it was added, it is fully present in
Fedora(no offence).

Regards,
Sreyan
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