dpkg -V, Что означает выход?

Из справочной страницы dpkg:

  -V, --verify [package-name...]
          Verifies the integrity of package-name or all packages if
          omitted, by comparing information from the files installed by
          a package with the files metadata information stored in the
          dpkg database (since dpkg 1.17.2).  The origin of the files
          metadata information in the database is the binary packages
          themselves. That metadata gets collected at package unpack
          time during the installation process.

          Currently the only functional check performed is an md5sum
          verification of the file contents against the stored value in
          the files database.  It will only get checked if the database
          contains the file md5sum. To check for any missing metadata in
          the database, the --audit command can be used.

          The output format is selectable with the --verify-format
          option, which by default uses the rpm format, but that might
          change in the future, and as such, programs parsing this
          command output should be explicit about the format they
          expect.

A "?" означает, что проверка не может быть выполнена, скорее всего, из-за отсутствия поддержки или прав доступа к файлам. «C» означает, что проверка выполняется в файле конфигурации.