There is a bunch of interesting order-of-events issues I'm discovering
with what I'm doing, and because of that it is creating errors that are
obscured in the packaging process.  I don't know if there's a fix, or
just some alerts, etc.  The package failure appears to be because I did
NOT set up a realm; intending to use ldap as the backend, I figured I
would NOT have krb5-kdc config create an initial realm.  This means when
it tries to start the service, I get this in the logs:

Cannot open DB2 database '/var/lib/krb5kdc/principal': No such file or
directory - while initializing database for realm SUBDOMAIN.DOMAIN.COM

The realm is defined by the install of krb5-config, so it knows the
realm it wants to use.  So, fine, maybe that's expected; then I go in
and run krb5_ldap_util to create the realm, and THAT led to another
error...the tool doesn't support TLS.  I get "Confidentiality required
while initializing database" which indicates a TLS error.  Disabled
forcing of tls on the ldap server and I could initialize the realm,
stash everything needed in keyfiles, and I was off to the races.

I don't know if there is a packaging fix (other than the advice from the
maintainers above about handling the systemd calls knowing they will
fail) but it's been interesting to troubleshoot.

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https://bugs.launchpad.net/bugs/2003756

Title:
  Cannot configure krb5-kdc on Ubuntu Jammy 22.04.01, "Could not execute
  systemctl:  at /usr/bin/deb-systemd-invoke line 142."

Status in init-system-helpers package in Ubuntu:
  New
Status in krb5 package in Ubuntu:
  New

Bug description:
  I have a fresh install of Ubuntu Server 22.04.01 LTS.  After
  installing the server and running all updates, I run the following
  command:

  apt -y install slapd ldap-utils schema2ldif sasl2-bin
  libsasl2-modules-gssapi-mit krb5-kdc-ldap krb5-admin-server krb5-kdc

  This will be installing krb5-kdc 1.19.2-2.

  This is in preparation for setting up an OpenLDAP server, a Kerberos
  server with an LDAP backend, and saslauthd for pass-through
  authentication.  krb5-kdc was auto-selected when running the steps in
  the guide here in my development environment:
  https://ubuntu.com/server/docs/service-kerberos-with-openldap-backend
  When installing that, I get the following in the output:

  Setting up krb5-kdc (1.19.2-2) ...
  Created symlink /etc/systemd/system/multi-user.target.wants/krb5-kdc.service 
→ /lib/systemd/system/krb5-kdc.service.
  Could not execute systemctl:  at /usr/bin/deb-systemd-invoke line 142.

  I do get the prompts for the realm, kdc, and admin server hostnames,
  and they are reflected in /etc/krb5.conf.  If I then run the
  following:

  dpkg-reconfigure krb5-kdc

  I am prompted for whether I want the package to create the Kerberos
  KDC configuration automatically, and when I say yes, it then repeats
  the following error:

  Could not execute systemctl:  at /usr/bin/deb-systemd-invoke line 142.

  I cannot find any further debug in the syslog or anything to indicate
  what the root cause is; the list of packages here are all installed
  together on a separate development server where I experimented with
  the configuration I will be deploying here in production so I don't
  think it's incompatible packages in the install list, but I am open to
  feedback on that.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/init-system-helpers/+bug/2003756/+subscriptions


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