Unpacking mantis (from .../mantis_1.2.10-1_all.deb) ...
Processing triggers for doc-base ...
Processing 2 added doc-base files...
Registering documents with scrollkeeper...
Setting up mantis (1.2.10-1) ...
Not replacing deleted config file /etc/mantis/apache.conf
chmod: cannot access `/etc/mantis/apache.conf': No such file or directory
dpkg: error processing mantis (--configure):
 subprocess installed post-installation script returned error exit status 1