Comment 3 for bug 993761

Sorry I'm late.

Alternate Installer (debian-install) for Ubuntu 12.04 only supports, I think, three different ciphers: aes-cbc-plain, aes-cbc-essiv, and something else. Afraid it is not very fresh in my mind. Certainly not anyting involving aes-xts-*.

This contrasts sharply with the standard desktop installer/LiveCD, which does support modern ciphers; it even comes with cryptsetup installed. However, I think it lacks support for properly creating filesystems in LUKS and LVM partitions. In my case, what I had to do was set up all the encryption, LVM, and filesystem stuff before starting the installer, including luksOpen and vgchange so that the filesystems would be fully visible to the installer. (In order to access the LVM stuff, I had to "apt-get install lvm2".) Afterward, before I rebooted out of the LiveCD environment, I mounted the partitions for the new install, chroot into it, then "apt-get install cryptsetup" (and "apt-get install lvm2") and manually set up "(/target)/etc/crypttab".

(Dealing with a grub-efi was a different frustrating issue.)