1. Howto install a .deb file
$ sudo dpkg -i package_file.deb
2. Hoto uninstall a .deb file
$ sudo dpkg -r package_name
3. Howto find version of a package installed
$ dpkg -l packagename
4. Howto List all installed files with version
$ dpkg -l
5. Howto convert .rpm files to .deb files
$ sudo alien package_file.rpm