critical
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I would like to say this bug still persist on Debian Stretch.
I suggest this bug to be marked as 'critical', since this could lead to data loss.
The debian installer doesn't recognize a previous encrypted volume (Tested with netinstall.iso). The critical is that even with workaround to recognize the partitions on encrypted volume the installer only advances on formating these partitions causing data-loss.
This is a long time bug and I think this could be fixed in time for Stretch release. I don't know if the Ubuntu installer is the same but this bug doesn't exists on Ubuntu.
How to achieve the bug:
Step 1:
On "Partition disk" go to "Configure encrypted volumes"
https://www.dropbox.com/s/xvsa2d6l4k925oz/step1.png
Step 2:
Select "Create encrypted volume". This will make anna install the necessary packages to work with encryption.
P.s.: on Ubuntu, this step shows an option to setup an existing encrypted volume.
https://www.dropbox.com/s/hii5g0uvewb3djq/step2.png
Step 3:
Go back.
https://www.dropbox.com/s/ckzb2r4pgirufum/step3.png
Step 4:
Do NOT save changes to disk.
https://www.dropbox.com/s/1s5r2h8x1rfi419/step4.png
Step 5:
Go back. Open a shell. Open luks volume. Activate volume group. Exit.
https://www.dropbox.com/s/658k4bqe5vzdpf1/step5.png
Step 6:
Detect disks. LVM partitions are now seen.
https://www.dropbox.com/s/6fdxpoqmef4htz6/step6.png
Step 7 (This is the critical bug):
Choosing any LVM partition and selecting to use as the previous format system leads to "re-format" the partition. This step should ask if you want to keep the existing file system. This could lead to /home data loss.
On Ubuntu you can choose to not format the partition at this stage.
https://www.dropbox.com/s/qmjiuv1enicg49b/step7.png
I hope this help to solve this annoying problem. Today its impossible to install Debian on an already encrypted system without data loss.
Cheers,
Kolmar Kafran.
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