package man-db 2.5.7-2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

[Florin Ivan]

Binary package hint: man-db

Ubuntu software Center is working in background, and it is stuck
In another console I typed :
sudo apt-get install htop
error: E: Sub-process /usr/bin/dpkg returned an error code (1)
was not a surprise but...
this is the all output:

florin@florin-vbox:~$ sudo apt-get install htop
[sudo] password for florin:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  linux-headers-2.6.32-21 linux-headers-2.6.32-21-generic
Use 'apt-get autoremove' to remove them.
The following NEW packages will be installed:
  htop
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 63.2kB of archives.
After this operation, 217kB of additional disk space will be used.
Get:1 http://ro.archive.ubuntu.com/ubuntu/ lucid/universe htop 0.8.3-1ubuntu1 [63.2kB]
Fetched 63.2kB in 0s (423kB/s)
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
Selecting previously deselected package htop.
(Reading database ... 146191 files and directories currently installed.)
Unpacking htop (from .../htop_0.8.3-1ubuntu1_i386.deb) ...
Processing triggers for desktop-file-utils ...
Processing triggers for python-gmenu ...
Rebuilding /usr/share/applications/desktop.en_US.utf8.cache...
Processing triggers for man-db ...
debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable
dpkg: error processing man-db (--unpack):
 subprocess installed post-installation script returned error exit status 1
Processing triggers for python-support ...
Errors were encountered while processing:
 man-db
E: Sub-process /usr/bin/dpkg returned an error code (1)
florin@florin-vbox:~$

ProblemType: Package
DistroRelease: Ubuntu 10.04
Package: man-db 2.5.7-2
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
AptOrdering:
 htop: Install
 htop: Configure
Architecture: i386
Date: Wed May 5 16:16:17 2010
ErrorMessage: subprocess installed post-installation script returned error exit status 1
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
SourcePackage: man-db
Title: package man-db 2.5.7-2 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1