I can confirm this affected me.

I installed to a system with some disks pre-encrypted - an old /home
which I was going to migrate to a new larger disk and some other data
partitions.  I also created some new encrypted data partitions on the
large disk in preparation.

I assigned the encrypted partitions a mount point (/data, etc),
expecting the installer to ask for the encryption password at some point

I specifically did not ask it to do any formatting.

On starting the install, the encrypted partitions were re-formatted and
all the data lost.

Of course, I had a backup, but I ended up with a number of unecrypted
partitions (other than home, which I chose to re-encrypt once I'd
realised what had happened).


I can see that I made a mistake in assigning a filesystem type (ext4), 
expecting that the installer would want to know the underlying filesystem, but 
there should definitely be a warning before destroying data when the format 
flag is not set.

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

Title:
  12.10 installer don't show encrypted partitions

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