upgrade error

Unpacking replacement apt ...
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
No apport report written because MaxReports is reached already
                                                              Errors were encountered while processing:
 man-db
E: Sub-process /usr/bin/dpkg returned an error code (1)