http://www.starling-software.com/en/blog/sysadmin/2010/02/27.cloning-an-encrypted-ubuntu-system.html
error:
$ update-initramfs -u -k all update-initramfs: Generating /boot/initrd.img-4.6.2-cw cryptsetup: WARNING: found more than one resume device candidate: ubuntu--vg-swap_1 newroot
fix in chroot:
$ emacs /etc/uswsusp.conf