[Bug 1095487] [NEW] Ubuntu installer manual partitioning: disk encryption strange behaviour

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My apologies for not spending much time on this bug. I hope someone else
can investigate the issue since I am short in time.

I have installed Ubuntu today over my existing Debian installation.
Unfortunately my ubuntu adventure has started very bad: my data
partition got formatted.

Steps I took in the installation procedure:
- I chose for custom partitioning
- I selected my debian root to be formatted as ext4 and mounted on /
- I clicked my data partition and in the use as field selected encrypted disk (or something similar)
- I entered my passphrase and clicked ok

At this point I realized the installer was probably creating a new Luks
partition instead of using the existing one, so I decided to instead set
up my data partition manually after the installation had been completed.

- I clicked the revert button a couple of times. It seemed to me at this point the installer was not altering my data partition.
- I clicked install

After rebooting and checking my data partition, I found out a new Luks
partition had been creaed. Furthermore, it had been formated as ext4,
though I am completely sure I did not check the format box for my data
partition.

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Ubuntu installer manual partitioning: disk encryption strange behaviour
https://bugs.launchpad.net/bugs/1095487
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