Unpacking apt-cacher (from .../apt-cacher_1.6.12ubuntu1_all.deb) ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
Setting up apt-cacher (1.6.12ubuntu1) ...
Running apt-cacher's install script...
Could not read config file: No such file or directory at /usr/share/apt-cacher/apt-cacher-lib.pl line 85.
dpkg: error processing apt-cacher (--configure):
 subprocess installed post-installation script returned error exit status 2