Public bug reported:

When doing a full disk encrypted installation with d-i using 
"Guided - use entire disk and setup encrypted LVM"
on a multipath device (in this case zFCP/SCSI)
the post-install reboot ends in busybox/initramfs
while trying to open/unlock an incorrect device-maper device.
d-i tries to open /dev/mapper/mpatha5 but only /dev/mapper/mpatha-part5 exists.

Fixing the wrong device in crypttab like:
echo "mpatha5_crypt /dev/mapper/mpatha-part5 none luks,discard" > ./
cryptroot/crypttab
and trying to open it manually:
cryptsetup open --key-file /etc/zkey/repository/mpatha5_crypt.skey --key-size 
1024 --cipher paes-xts-plain64 /dev/mapper/mpatha-part5 mpatha5_crypt
and leaving busybox again seems to work.

For more details see attachment ...

** Affects: ubuntu-z-systems
     Importance: Medium
     Assignee: Dimitri John Ledkov (xnox)
         Status: New

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "details.txt"
   
https://bugs.launchpad.net/bugs/1825189/+attachment/5256551/+files/details.txt

** Also affects: debian-installer (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1825189

Title:
  Using full disk encryption, on a multipath device (in this case FCP)
  ended up in trying to open/unlock a wrong DM device

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