Hi and thanks for the report,
it seems that the automatic "try to backup and upgrade" failed.
That is usually due to local config that does not behave well as it needs knowledge or assumptions the package can't have. Or at other times by using features that have been removed.

The log output is actually quite clear on what it tried, and that it suggests to the admin to overcome this to continue.

"""
Preparing to unpack .../20-slapd_2.5.16+dfsg-0ubuntu0.22.04.1_amd64.deb ...
Saving current slapd configuration to /var/backups/slapd-2.4.49+dfsg-2ubuntu1.9...
  Dumping to /var/backups/slapd-2.4.49+dfsg-2ubuntu1.9: 
  - directory dc=1tmfm1mfbauutnso5ahdvmpnma,dc=gx,dc=internal,dc=cloudapp,dc=ne... slapcat: slap_init no backend for "dc=1tmfm1mfbauutnso5ahdvmpnma,dc=gx,dc=internal,dc=cloudapp,dc=ne"
failed.
[?1049h[?1h=[?25l                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               Package configuration┌───────────────────────────────────────────────────────────────────────────────────┤ Configuring slapd ├────────────────────────────────────────────── ─────────────────────────────────────┐│                                                                                                                                                                                           │ │ slapcat failure during upgrade                                                                                                                                                            │ │                                                                                                                                                                                           │ │ An error occurred while upgrading the LDAP directory.                                                                                                                                     │  │                                                                                                                                                                                           │ │ The 'slapcat' program failed while extracting the LDAP directory. This may be caused by an incorrect configuration file (for example, missing 'moduleload' lines to support the backend   │ │ database).                                                                                                                                                                                │ │                                                                                                                                                                                           │ │ This failure will cause 'slapadd' to fail later as well. The old database files will be moved to  /var/backups. If you want to try this upgrade again, you should move the old database    │ │ files back into place, fix whatever caused slapcat to fail, and run:                                                                                                                      │ │                                                                                                                                                                                           │ │  slapcat > /var/backups/slapd-2.4.49+dfsg-2ubuntu1.9                                                                                                                                      │ │                                                                                                                                                                                           │ [26 ;3H│                                                                                                                                                                                           │ │ Then move the database files back to a backup area and then try running slapadd from /var/backups/slapd-2.4.49+dfsg-2ubuntu1.9.                                                           │ │                                                                                                                                                                                           │ │                                                                                          <Ok>                                                                                             │ │                                                                                                                                                                                            │ └───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘                                                                                                                                                                                              [?25h
                                                                                                                                                                                                  
[?1l>[?1049ldpkg: error processing archive /tmp/apt-dpkg-install-INN4tL/20-slapd_2.5.16+dfsg-0ubuntu0.22.04.1_amd64.deb (--unpack):
 new slapd package pre-installation script subprocess returned error exit status 1
"""

I really can't say much more than what is in this log message.