[Bug 1802462] Re: When s390-tools-zkey package is not installed 'zkey -h' lists wrong package name in apt hint

[Frank Heimes]

** Changed in: ubuntu-z-systems
       Status: Fix Committed => Fix Released

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Title:
  When s390-tools-zkey package is not installed 'zkey -h' lists wrong
  package name in apt hint

Status in Ubuntu on IBM z Systems:
  Fix Released
Status in command-not-found package in Ubuntu:
  Fix Released
Status in command-not-found source package in Cosmic:
  Fix Released

Bug description:
  [SRU Justification]
  The contents of command-not-found-data in cosmic are out of date with respect to the archive, resulting in misleading suggestions offered to users for some commands.

  [Test case]
  1. Install command-not-found
  2. . /etc/bash.bashrc
  3. Install btrfs-progs.
  4. Ensure that the package cloud-init is not installed.
  5. Type 'btrfs-debug-tree'.  Observe that bash suggests installing btrfs-progs, even though btrfs-progs is installed (and does not provide a btrfs-debug-tree command).
  6. Type 'cloud-id'.  Observe that bash returns the general 'command not found' error.
  7. Install command-not-found from -proposed.
  8. Type 'btrfs-debug-tree' again.  Observe that bash correctly reports 'command not found'.
  9. Type 'cloud-id' again. Observe that bash suggests to install the cloud-init package.

  [Regression potential]
  In the event that there is bad data in the database update, command-not-found may return wrong suggestions after this SRU.  It is already doing so currently, and there are no known instances of bad data in the database updates, so this possibility is not a reason to block the SRU.

  OS: Ubuntu 18.10 providing s390-tools_2.6.0-0ubuntu7_s390x.deb
  When the 's390-tools-zkey' package is NOT installed, the installation hint given by zkey -h is not as expected

  Environment:
  IBM Z 13 or Z 14 LPAR or z/VM

  Details
  =======
  On an IBM Z13 or Z14 based Ubuntu 18.10 system where the 'zkey' tool is not yet installed,
  the installation hint given by zkey is misleading.
  The hint should read: 'apt install s390-tools-zkey'

  The apt-cache search for zkey displays the expected package name,
  though.

  Ran the above install command which succeeded as expected, the zkey
  tool was available.

  ---uname output---
  Linux system 4.18.0-10-generic #11-Ubuntu SMP Thu Oct 11 15:06:06 UTC 2018 s390x s390x s390x GNU/Linux

  Machine Type = IBM Type: 3906 LIC Identifier:   505724ff5b747876

  ---Debugger---
  A debugger is not configured

  ---Steps to Reproduce---
   1.) Install Ubuntu 18.10 onto an LPAR or z/VM system
  2.) Ensure the zkey tool is not installed
  3.) run: zkey -h
  # zkey -h

  Command 'zkey' not found, but can be installed with:

  apt install s390-tools

  Userspace tool common name: apt

  The userspace tool has the following bit modes: 64bit

  Userspace rpm: s390-tools_2.6.0-0ubuntu7_s390x.deb

  Userspace tool obtained from project website:  na

  *Additional Instructions for Christian.Rund at de.ibm.com:
  -Attach ltrace and strace of userspace application.

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