[Bug 1841672] [NEW] CryptSetup packages should not be removed by `apt-get autoremove` on system installed with encryption and LVM

[Norbert]

Public bug reported:

Steps to reproduce:
1. Install Ubuntu 19.10 MATE with Encryption and LVM
2. Ensure that it boots after install
3. Run `sudo apt autoremove`

Expected results:
* there are no packages to remove

Actual results:
* it tries to remove cryptsetup:

$ sudo apt autoremove
[sudo] password for mate:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  cryptsetup cryptsetup-bin cryptsetup-initramfs cryptsetup-run
0 upgraded, 0 newly installed, 4 to remove and 23 not upgraded.
After this operation, 1 178 kB disk space will be freed.
Do you want to continue? [Y/n]

and this will lead on un-bootable encrypted system.
This is very unexpected and dangerous.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: cryptsetup 2:2.2.0-2ubuntu1
ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
Uname: Linux 5.2.0-10-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CurrentDesktop: MATE
Date: Tue Aug 27 23:55:09 2019
InstallationDate: Installed on 2019-08-27 (0 days ago)
InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Alpha amd64 (20190827)
SourcePackage: cryptsetup
UpgradeStatus: No upgrade log present (probably fresh install)
cmdline: BOOT_IMAGE=/vmlinuz-5.2.0-10-generic root=/dev/mapper/vgubuntu--mate-root ro quiet splash
crypttab: sda5_crypt UUID=784fac4b-d7a4-4e62-b57e-7ce01e8b0160 none luks,discard

** Affects: cryptsetup (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: ubuntu-mate-meta (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug eoan iso-testing

** Also affects: ubiquity (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: ubuntu-mate-meta (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

  Steps to reproduce:
  1. Install Ubuntu 19.10 MATE with Encryption and LVM
  2. Ensure that it boots after install
  3. Run `sudo apt autoremove`
  
  Expected results:
  * there are no packages to remove
  
  Actual results:
  * it tries to remove cryptsetup:
  
- $ sudo apt autoremove 
- [sudo] password for mate: 
+ $ sudo apt autoremove
+ [sudo] password for mate:
  Reading package lists... Done
- Building dependency tree       
+ Building dependency tree
  Reading state information... Done
  The following packages will be REMOVED:
-   cryptsetup cryptsetup-bin cryptsetup-initramfs cryptsetup-run
+   cryptsetup cryptsetup-bin cryptsetup-initramfs cryptsetup-run
  0 upgraded, 0 newly installed, 4 to remove and 23 not upgraded.
  After this operation, 1 178 kB disk space will be freed.
- Do you want to continue? [Y/n] 
+ Do you want to continue? [Y/n]
  
  and this will lead on un-bootable encrypted system.
+ This is very unexpected and dangerous.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: cryptsetup 2:2.2.0-2ubuntu1
  ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
  Uname: Linux 5.2.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Tue Aug 27 23:55:09 2019
  InstallationDate: Installed on 2019-08-27 (0 days ago)
  InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Alpha amd64 (20190827)
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  cmdline: BOOT_IMAGE=/vmlinuz-5.2.0-10-generic root=/dev/mapper/vgubuntu--mate-root ro quiet splash
  crypttab: sda5_crypt UUID=784fac4b-d7a4-4e62-b57e-7ce01e8b0160 none luks,discard

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https://bugs.launchpad.net/bugs/1841672

Title:
  CryptSetup packages should not be removed by `apt-get autoremove` on
  system installed with encryption and LVM

Status in cryptsetup package in Ubuntu:
  Confirmed
Status in ubiquity package in Ubuntu:
  Confirmed
Status in ubuntu-mate-meta package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce:
  1. Install Ubuntu 19.10 MATE with Encryption and LVM
  2. Ensure that it boots after install
  3. Run `sudo apt autoremove`

  Expected results:
  * there are no packages to remove

  Actual results:
  * it tries to remove cryptsetup:

  $ sudo apt autoremove
  [sudo] password for mate:
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  The following packages will be REMOVED:
    cryptsetup cryptsetup-bin cryptsetup-initramfs cryptsetup-run
  0 upgraded, 0 newly installed, 4 to remove and 23 not upgraded.
  After this operation, 1 178 kB disk space will be freed.
  Do you want to continue? [Y/n]

  and this will lead on un-bootable encrypted system.
  This is very unexpected and dangerous.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: cryptsetup 2:2.2.0-2ubuntu1
  ProcVersionSignature: Ubuntu 5.2.0-10.11-generic 5.2.4
  Uname: Linux 5.2.0-10-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Tue Aug 27 23:55:09 2019
  InstallationDate: Installed on 2019-08-27 (0 days ago)
  InstallationMedia: Ubuntu-MATE 19.10 "Eoan Ermine" - Alpha amd64 (20190827)
  SourcePackage: cryptsetup
  UpgradeStatus: No upgrade log present (probably fresh install)
  cmdline: BOOT_IMAGE=/vmlinuz-5.2.0-10-generic root=/dev/mapper/vgubuntu--mate-root ro quiet splash
  crypttab: sda5_crypt UUID=784fac4b-d7a4-4e62-b57e-7ce01e8b0160 none luks,discard

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