partman-crypto does support activating existing volumes on ubuntu.
In d-i interface, one needs to enter manual partitioning, enter encryption 
sub-menu and select option to activate existing encrypted volumes. At which 
point all encrypted volumes will be attempted to be activated and user maybe 
asked for a password (multiple times, if there is more than one encrypted 
volume). After which one needs to back-out to automatic partitioning & gain 
options to for example upgrade encrypted volume.

This "loop via activating crypt volumes" can be implemented directly, or
we can modify ubiquity's embedded d-i to execute that option for us and
do question pop-ups about that.

But there is a caveat, once activated one cannot "deactivate" those
volumes. See bug 291494 .

Also "resize" option can be dangerous, as there is no proper resize
support for neither LVM2 nor dm-crypt volumes.

The "upgrade" or "reuse" options can be dangerous as well, since I am
suspecting that lvm2 and/or ecryptfs user space tools might not be
installed. In any case those options should be tested.

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https://bugs.launchpad.net/bugs/1066480

Title:
  Installer doesn't show encrypted partitions

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