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

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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.

** Affects: ubuntu-z-systems
     Importance: Medium
     Assignee: Canonical Foundations Team (canonical-foundations)
         Status: Triaged

** Affects: command-not-found (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-172984 severity-medium targetmilestone-inin1810
-- 
When s390-tools-zkey package is not installed 'zkey -h' lists wrong package name in apt hint
https://bugs.launchpad.net/bugs/1802462
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