I can confirm that it works with package 2.14.0-1ubuntu1.1:
$ dpkg -l | grep s390-tools
ii  s390-tools                            2.14.0-1ubuntu1.1                 
s390x        fundamental utilities for Linux on z Systems
ii  s390-tools-signed                     2.14.0-1ubuntu1.1                 
s390x        Signed zipl stage3.bin

I get again proper version and help info - even if the sampling facility
is not active:

$ chcpumf -v
CPU-measurement facility utilities, version 2.12.0-build-20200320
Copyright IBM Corp. 2014, 2017

$ chcpumf -h
Usage:  chcpumf -h|-v
        chcpumf -m num_sdb
        chcpumf -x num_sdb

Options:
        -m num_sdb    Specifies the initial size of the sampling buffer.
                      A sample-data-block (SDB) consumes about 4 kilobytes.
        -x num_sdb    Specifies the maximum size of the sampling buffer.
                      A sample-data-block (SDB) consumes about 4 kilobytes.
        -h            Displays help information, then exits.
        -v            Displays version information, then exits.

For more help information, issue 'man chcpumf'.

Adjusting the tags accordingly ...

** Tags removed: verification-needed verification-needed-groovy
** Tags added: verification-done verification-done-groovy

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https://bugs.launchpad.net/bugs/1898935

Title:
  chcpumf installed with s390-tools version 2.14.0 no longer provides
  version or help information

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