[Bug 1813126] Re: Full-disk encryption: Unbootable system after upgrade to Ubuntu 19.04 Disco Dingo

[TJ]

I've confirmed this with a new 19.04 install, and it's not just the
d-r-u process.

In a manually configured system with:

sda3 -> LUKS_BOOT > /boot/
sda4 -> sda4_crypt -> LVM -> /dev/mapper/ubuntu-rootfs -> /

# grep -rn  GRUB_ENABLE_CRYPTODISK /etc/default/grub /etc/grub.d/ /usr/lib/grub/ /usr/sbin/grub* /usr/share/grub/
/etc/default/grub:33:GRUB_ENABLE_CRYPTODISK=y
Binary file /usr/sbin/grub-install matches
/usr/sbin/grub-mkconfig:245:  GRUB_ENABLE_CRYPTODISK \
/usr/share/grub/grub-mkconfig_lib:77:  if [ x$GRUB_ENABLE_CRYPTODISK = xy ]; then
/usr/share/grub/grub-mkconfig_lib:162:  if [ x$GRUB_ENABLE_CRYPTODISK = xy ]; then

# grub-install /dev/sda
# update-grub

both fail to add the luks and crypto modules. Core image doesn't get
them:

grub-install: info: grub-mkimage --directory '/usr/lib/grub/i386-pc'
--prefix '/grub' --output '/boot/grub/i386-pc/core.img' --format
'i386-pc' --compression 'auto'  --config '/boot/grub/i386-pc/load.cfg'
'ext2' 'biosdisk' 'search_fs_uuid'

and nor does /boot/grub/grub.cfg:

...
menuentry 'Ubuntu' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-a0f21372-a236-4e33-9bfa-9921ca89d5b7' {
        recordfail
        load_video
        gfxmode $linux_gfx_mode
        insmod gzio
        if [ x$grub_platform = xxen ]; then insmod xzio; insmod lzopio; fi
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root  997c6523-62d6-4274-bf2b-3fa0bef7f181
        else
          search --no-floppy --fs-uuid --set=root 997c6523-62d6-4274-bf2b-3fa0bef7f181
        fi
        linux   /vmlinuz-5.0.0-16-generic root=/dev/mapper/ubuntu-rootfs ro  quiet splash $vt_handoff
        initrd  /initrd.img-5.0.0-16-generic
}
...

** Summary changed:

- Full-disk encryption: Unbootable system after upgrade to Ubuntu 19.04 Disco Dingo
+ [19.04] GRUB_ENABLE_CRYPTODISK=y ignored

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https://bugs.launchpad.net/bugs/1813126

Title:
  [19.04] GRUB_ENABLE_CRYPTODISK=y ignored

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  On my freshly-installed and up-to-date 18.10 with full-disk encryption, I decided to upgrade to 19.04 (dev) using _update-manager -d_.
  Everything seemed fine, until I rebooted and the Grub configuration apparently had been overwritten, and it does not offer to enter the master password, so cannot find the root VG.

  This is all happening on my Lenovo T480 PC, with only Ubuntu (no dual-
  boot).

  I tried boot-repair, applying any suggestion it threw at me, but it
  could not fix the issue.

  I did try to add GRUB_ENABLE_CRYPTODISK=y in /etc/default/grub and
  successfully run update-grub in a chroot, but this did not fix the
  issue.

  Feel free to ask for more details, but diagnostic is limited, as the
  system is not booting, from the very early stages.

  Thanks.

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