Comment 0 for bug 1801629

In a fresh/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) drive 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 main drive.

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)