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diff --git a/src/core/common/CoreCommonUtil.h b/src/core/common/CoreCommonUtil.h
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+/**
+ * Copyright (C) 2021 Saturneric
+ *
+ * This file is part of GpgFrontend.
+ *
+ * GpgFrontend is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GpgFrontend is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GpgFrontend. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from
+ * the gpg4usb project, which is under GPL-3.0-or-later.
+ *
+ * The source code version of this software was modified and released
+ * by Saturneric<[email protected]><[email protected]> starting on May 12, 2021.
+ *
+ */
+
+#ifndef GPGFRONTEND_CORECOMMONUTIL_H
+#define GPGFRONTEND_CORECOMMONUTIL_H
+
+#include "core/GpgFrontendCore.h"
+
+namespace GpgFrontend {
+
+class GPGFRONTEND_CORE_EXPORT CoreCommonUtil : public QObject {
+  Q_OBJECT
+ public:
+  /**
+   * @brief Construct a new Core Common Util object
+   *
+   */
+  static CoreCommonUtil *GetInstance();
+
+  /**
+   * @brief
+   *
+   */
+  CoreCommonUtil() = default;
+
+ signals:
+
+  /**
+   * @brief
+   *
+   */
+  void SignalGnupgNotInstall();
+
+ private:
+  static std::unique_ptr<CoreCommonUtil> instance_;  ///<
+};
+
+}  // namespace GpgFrontend
+
+#endif  // GPGFRONTEND_CORECOMMONUTIL_H