Hello Rob.
Thank you for your reply.
Here is the log from the ipa client 4.4 uninstallation :
###
2019-08-26T11:52:26Z DEBUG /sbin/ipa-client-install was invoked with options: {'domain': None, 'force': True, 'krb5_offline_passwords': True, 'ip_addresses': [], 'configure_firefox': False, 'primary': False, 'realm_name': None, 'force_ntpd': False, 'create_sshfp': True, 'conf_sshd': True, 'conf_ntp': True, 'on_master': False, 'no_nisdomain': False, 'nisdomain': None, 'ca_cert_file': None, 'principal': None, 'keytab': None, 'hostname': None, 'request_cert': False, 'trust_sshfp': False, 'no_ac': False, 'unattended': None, 'all_ip_addresses': False, 'location': None, 'sssd': True, 'ntp_servers': None, 'kinit_attempts': 5, 'dns_updates': False, 'conf_sudo': True, 'conf_ssh': True, 'force_join': False, 'firefox_dir': None, 'server': None, 'prompt_password': False, 'permit': False, 'debug': False, 'preserve_sssd': False, 'mkhomedir': False, 'uninstall': True}
2019-08-26T11:52:26Z DEBUG missing options might be asked for interactively later
2019-08-26T11:52:26Z DEBUG IPA version 4.4.0-12.el7
2019-08-26T11:52:26Z DEBUG Loading Index file from '/var/lib/ipa/sysrestore/sysrestore.index'
2019-08-26T11:52:26Z DEBUG Starting external process
2019-08-26T11:52:26Z DEBUG args=ipa-client-automount --uninstall --debug
2019-08-26T11:52:27Z DEBUG Process finished, return code=0
2019-08-26T11:52:27Z DEBUG stdout=Restoring configuration
2019-08-26T11:52:27Z DEBUG stderr=/etc/host.conf: line 2: bad command `nospoof off'
/etc/host.conf: line 5: bad command `spoof off'
/etc/host.conf: line 6: bad command `spoofalert off'
WARNING: yacc table file version is out of date
2019-08-26T11:52:27Z DEBUG Loading Index file from '/var/lib/ipa-client/sysrestore/sysrestore.index'
2019-08-26T11:52:27Z DEBUG Loading StateFile from '/var/lib/ipa-client/sysrestore/sysrestore.state'
2019-08-26T11:52:27Z DEBUG Starting external process
2019-08-26T11:52:27Z DEBUG args=/usr/bin/certutil -d /etc/ipa/nssdb -L -n Local IPA host -a
2019-08-26T11:52:27Z DEBUG Process finished, return code=255
2019-08-26T11:52:27Z DEBUG stdout=
2019-08-26T11:52:27Z DEBUG stderr=certutil: function failed: SEC_ERROR_LEGACY_DATABASE: The certificate/key database is in an old, unsupported format.
2019-08-26T11:52:27Z DEBUG Starting external process
2019-08-26T11:52:27Z DEBUG args=/usr/bin/certutil -d /etc/pki/nssdb -L -n IPA Machine Certificate - <MY_CLIENT_HOST> -a
2019-08-26T11:52:27Z DEBUG Process finished, return code=255
2019-08-26T11:52:27Z DEBUG stdout=
2019-08-26T11:52:27Z DEBUG stderr=certutil: Could not find cert: IPA Machine Certificate - <MY_CLIENT_HOST>
: PR_FILE_NOT_FOUND_ERROR: File not found
2019-08-26T11:52:27Z DEBUG Starting external process
2019-08-26T11:52:27Z DEBUG args=/bin/systemctl start certmonger.service
2019-08-26T11:52:27Z DEBUG Process finished, return code=1
2019-08-26T11:52:27Z DEBUG stdout=
2019-08-26T11:52:27Z DEBUG stderr=Job for certmonger.service failed because the control process exited with error code. See "systemctl status certmonger.service" and "journalctl -xe" for details.
2019-08-26T11:52:27Z ERROR Failed to start certmonger: Command '/bin/systemctl start certmonger.service' returned non-zero exit status 1
###
Best regards.
Lune