Issue the command:
dpkg -L package_name
If you are not sure which package installed a file, dpkg -S may be able to tell you. For example:
dpkg -S /etc/host.conf base-files: /etc/host.conf
The output shows that the /etc/host.conf belongs to the base-files package.
NOTE: Many files are automatically generated during the package install process, and even though they are on the filesystem,
dpkg -S may not know which package they belong to.