[Bug 1492889] Re: installing on existing luks/btrfs doesn't ask for passphrase at boot

[fugounashi]

the bug is also present in Ubuntu 15.04

the cause is that no crypttab is created

a workaround is as follows (using encrypted volume with existing btrfs
on sda4 and boot on sda3 as an example):

(boot install disc, try Ubuntu without installing, and open the encrypted volume as required by https://bugs.launchpad.net/bugs/1066480 https://wiki.ubuntu.com/TrustyTahr/ReleaseNotes/#Boot.2C_installation_and_post-install)
# cryptsetup luksOpen /dev/sda4 sda4_crypt
(perform the installation)
# mount /dev/mapper/sda4_crypt /mnt
# cd /mnt
(clean up leakage)
#  rm ubiquity-apt-clone/apt-clone-state-ubuntu.tar.gz 
#  rmdir ubiquity-apt-clone/ var/lib/ var/
(find the uuid)
# blkid /dev/sda4
(create missing crypttab using uuid)
# echo "sda4_crypt UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx none luks" > /mnt/@/etc/crypttab
(update initrd and grub)
# cd @
# mount /dev/sda3 boot
# for d in dev sys proc; do mount --bind /$d $d; done
# chroot /mnt/@
# update-initramfs -k all -c
# shutdown -r now

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https://bugs.launchpad.net/bugs/1492889

Title:
  installing on existing luks/btrfs doesn't ask for passphrase at boot

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04.3 LTS

  after manual cryptsetup luksOpen (as per 1066480)  I selected the
  existing btrfs as root (having renamed the existing root and home
  subvolumes)

  installation proceeds and installs to new root and home subvolumes however the system is not correctly configured to boot:  
    
    no dm-crypt module or cryptsetup in initramfs

    no prompt for passphrase at boot
    
  thanks!

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