package slapd 2.4.23-6ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[James Overton]

fail

ProblemType: Package
DistroRelease: Ubuntu 11.04
Package: slapd 2.4.23-6ubuntu6
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
Architecture: i386
CNConfig: Error: command ['/usr/bin/ldapsearch', '-Q', '-LLL', '-Y EXTERNAL', '-H ldapi:///', '-b cn=config'] failed with exit code 255: ldap_sasl_interactive_bind_s: Can't contact LDAP server (-1)
Date: Sat Sep 3 07:55:40 2011
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
SourcePackage: openldap
SysLog:
 Sep 3 07:55:40 trekkie AptDaemon.Worker: CRITICAL: slapd: subprocess installed post-installation script returned error exit status 1
 Sep 3 07:55:47 trekkie AptDaemon.Worker: CRITICAL: slapd: subprocess installed post-installation script returned error exit status 1
Title: package slapd 2.4.23-6ubuntu6 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1
UpgradeStatus: Upgraded to natty on 2011-08-07 (27 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ryan Tandy (rtandy)]

From the upgrade log:

Setting up slapd (2.4.23-6ubuntu6) ...
  Backing up /etc/ldap/slapd.d in /var/backups/slapd-2.4.21-0ubuntu5.4... done.
  Moving old database directories to /var/backups:
  Loading from /var/backups/slapd-2.4.21-0ubuntu5.4:
  - directory dc=trekkie... failed.

Loading the database from the LDIF dump failed with the following
error while running slapadd:
    /var/backups/slapd-2.4.21-0ubuntu5.4/dc=trekkie.ldif: No such file or directory

but there's no indication of why that file is missing.

Without that information, I don't think there's any way I can help with this one.