[Bug 1801629] Re: xubuntu-core needs to depend on cryptsetup and lvm2 or 'apt autoremove' will make a LUKS+LVM encrypted root partition non-bootable

[lumbricus]

I think I've been successful recovering the installation. Please let me
know if this makes sense or if there are any mistakes. People running
into this, will be happy to find recovery instructions here.

See also: https://askubuntu.com/a/1120949/27088


# find root partition
sudo fdisk -l

# unencrypt partition
#   Note: replace /dev/nvme0n1p3 with your disk
#         replace "nvme0n1p3_crypt" with the correct name 
#         check by running this in chroot:
#         $ cat /etc/crypttab | cut -f1 -d " "
#         nvme0n1p3_crypt
sudo cryptsetup luksOpen /dev/nvme0n1p3 nvme0n1p3_crypt

# mount root partition
sudo vgscan 
sudo vgchange -ay
sudo mount /dev/mapper/xubuntu--vg-root /mnt

# prepare chroot environment
sudo mount /dev/nvme0n1p2 /mnt/boot/
sudo mount -o rbind /dev/ /mnt/dev/
sudo mount -t proc proc /mnt/proc/
sudo mount -t sysfs sys /mnt/sys/

# make dns available in chroot
sudo cp /etc/resolv.conf  /mnt/etc/resolv.conf 

# enter chroot
sudo chroot /mnt /bin/bash

# re-install missing packages
apt install cryptsetup lvm2

# re-generate  (this might be done also by apt in the step before, I'm not sure)
update-initramfs -u -k all

# Leave chroot environment
exit
# Write buffers to disk
sudo sync
# Unmount file systems
sudo umount /mnt/sys
sudo umount /mnt/proc
sudo umount /mnt/boot

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https://bugs.launchpad.net/bugs/1801629

Title:
  xubuntu-core needs to depend on cryptsetup and lvm2 or 'apt
  autoremove' will make a LUKS+LVM encrypted root partition non-bootable

Status in OEM Priority Project:
  Fix Committed
Status in livecd-rootfs package in Ubuntu:
  Fix Committed
Status in ubiquity package in Ubuntu:
  Triaged
Status in ubuntu-mate-meta package in Ubuntu:
  Invalid
Status in xubuntu-meta package in Ubuntu:
  Invalid
Status in livecd-rootfs source package in Bionic:
  Confirmed
Status in ubiquity source package in Bionic:
  Invalid
Status in ubuntu-mate-meta source package in Bionic:
  Invalid
Status in xubuntu-meta source package in Bionic:
  Invalid
Status in livecd-rootfs source package in Cosmic:
  Won't Fix
Status in ubiquity source package in Cosmic:
  Won't Fix
Status in ubuntu-mate-meta source package in Cosmic:
  Invalid
Status in xubuntu-meta source package in Cosmic:
  Invalid
Status in livecd-rootfs source package in Disco:
  Fix Committed
Status in ubiquity source package in Disco:
  Triaged
Status in ubuntu-mate-meta source package in Disco:
  Invalid
Status in xubuntu-meta source package in Disco:
  Invalid

Bug description:
  In a clean install of Xubuntu 18.10, if an unsuspecting user runs 'apt
  autoremove', it will remove 'cryptsetup' and 'lvm2' making the system
  non-bootable at next restart if an encrypted(LUKS+LVM) root partition
  was selected during the ubiquity installer wizard:

  $ sudo apt update && sudo apt --auto-remove full-upgrade && cat /run/reboo*
  <snip...>
  The following packages will be REMOVED:
    cryptsetup cryptsetup-bin cryptsetup-initramfs cryptsetup-run dmeventd libdevmapper-event1.02.1 liblvm2app2.2 liblvm2cmd2.02 libreadline5 lvm2
  <...snip>

  This _will_ make the system non-bootable upon restart if LUKS+LVM are
  active on the root partition. This would, by extension, make any auto-
  mounted partitions(home, etc.) unavailable after boot as well!

  WORKAROUND:

  $ sudo apt install cryptsetup lvm2
  <snip...>
  cryptsetup is already the newest version (2:2.0.4-2ubuntu2).
  cryptsetup set to manually installed.
  lvm2 is already the newest version (2.02.176-4.1ubuntu3).
  lvm2 set to manually installed.
  <...snip>

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: xubuntu-core 2.227
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sun Nov  4 18:20:38 2018
  InstallationDate: Installed on 2018-11-04 (0 days ago)
  InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2)
  SourcePackage: xubuntu-meta
  UpgradeStatus: No upgrade log present (probably fresh install)

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