E: man-db: subprocess installed post-installation script returned error exit status 255

sudo dpkg --configure -a

Setting up man-db (2.5.7-2) ...
Can't exec "/var/lib/dpkg/info/man-db.config": Permission denied at /usr/share/perl/5.10/IPC/Open3.pm line 168.
open2: exec of /var/lib/dpkg/info/man-db.config configure 2.5.7-2 failed at /usr/share/perl5/Debconf/ConfModule.pm line 59
dpkg: error processing man-db (--configure):
 subprocess installed post-installation script returned error exit status 255
Errors were encountered while processing:
 man-db