diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6edece315..8603099db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,6 +54,7 @@ option( BUILD_TESTING "Build the testing tree." ON )
 option( WITH_PYTHON "Enable Python modules API (requires Boost.Python)." ON )
 option( WITH_PYTHONQT "Enable next generation Python modules API (experimental, requires PythonQt)." OFF )
 option( WITH_KF5Crash "Enable crash reporting with KCrash." ON )
+option( WITH_KF5DBus "Use DBus service for unique-application." ON )
 
 # Possible debugging flags are:
 #  - DEBUG_TIMEZONES draws latitude and longitude lines on the timezone
@@ -290,7 +291,7 @@ if( ECM_FOUND )
     include(KDEInstallDirs)
 endif()
 
-find_package( KF5 QUIET COMPONENTS CoreAddons Crash )
+find_package( KF5 QUIET COMPONENTS CoreAddons Crash DBusAddons )
 set_package_properties(
     KF5::CoreAddons PROPERTIES
     TYPE REQUIRED
@@ -299,8 +300,17 @@ set_package_properties(
     PURPOSE "About Calamares"
 )
 if( NOT KF5Crash_FOUND )
+    if( WITH_KF5Crash )
+        message(WARNING "WITH_KF5Crash is set, but KF5::Crash is not available.")
+    endif()
     set( WITH_KF5Crash OFF )
 endif()
+if( NOT KF5DBusAddons_FOUND )
+    if( WITH_KF5DBus )
+        message(WARNING "WITH_KF5DBus is set, but KF5::DBusAddons is not available.")
+    endif()
+    set( WITH_KF5DBus OFF )
+endif()
 
 if( BUILD_TESTING )
     enable_testing()
@@ -520,6 +530,7 @@ add_feature_info(Python ${WITH_PYTHON} "Python job modules")
 add_feature_info(PythonQt ${WITH_PYTHONQT} "Python view modules")
 add_feature_info(Config ${INSTALL_CONFIG} "Install Calamares configuration")
 add_feature_info(KCrash ${WITH_KF5Crash} "Crash dumps via KCrash")
+add_feature_info(KDBusAddons ${WITH_KF5DBus} "Unique-application via DBus")
 
 # Add all targets to the build-tree export set
 set( CMAKE_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/Calamares" CACHE PATH  "Installation directory for CMake files" )
diff --git a/src/calamares/CMakeLists.txt b/src/calamares/CMakeLists.txt
index 81fd0d132..336c27317 100644
--- a/src/calamares/CMakeLists.txt
+++ b/src/calamares/CMakeLists.txt
@@ -41,12 +41,13 @@ target_link_libraries( calamares_bin
         KF5::CoreAddons
 )
 if( WITH_KF5Crash )
-    target_link_libraries( calamares_bin
-        PRIVATE
-            KF5::Crash
-    )
+    target_link_libraries( calamares_bin PRIVATE KF5::Crash )
     target_compile_definitions( calamares_bin PRIVATE WITH_KF5Crash )
 endif()
+if( WITH_KF5DBus )
+    target_link_libraries( calamares_bin PRIVATE KF5::DBusAddons )
+    target_compile_definitions( calamares_bin PRIVATE WITH_KF5DBus )
+endif()
 
 install( TARGETS calamares_bin
     BUNDLE DESTINATION .
diff --git a/src/calamares/main.cpp b/src/calamares/main.cpp
index 2af46119b..030ccc239 100644
--- a/src/calamares/main.cpp
+++ b/src/calamares/main.cpp
@@ -25,11 +25,17 @@
 #include "utils/Logger.h"
 #include "utils/Retranslator.h"
 
+#ifndef WITH_KF5DBus
+#warning "KDSingleApplicationGuard is deprecated"
 #include "3rdparty/kdsingleapplicationguard/kdsingleapplicationguard.h"
+#endif
 
-#include <KF5/KCoreAddons/KAboutData>
+#include <KCoreAddons/KAboutData>
+#ifdef WITH_KF5DBus
+#include <KDBusAddons/KDBusService>
+#endif
 #ifdef WITH_KF5Crash
-#include <KF5/KCrash/KCrash>
+#include <KCrash/KCrash>
 #endif
 
 #include <QCommandLineParser>
@@ -63,7 +69,13 @@ debug_level( QCommandLineParser& parser, QCommandLineOption& levelOption )
     }
 }
 
-static void
+/** @brief Handles the command-line arguments
+ *
+ * Sets up internals for Calamares based on command-line arguments like `-D`,
+ * `-d`, etc. Returns @c true if this is a *debug* run, i.e. if the `-d`
+ * command-line flag is given, @c false otherwise.
+ */
+static bool
 handle_args( CalamaresApplication& a )
 {
     QCommandLineOption debugOption( QStringList { "d", "debug" },
@@ -100,8 +112,8 @@ handle_args( CalamaresApplication& a )
         CalamaresUtils::setXdgDirs();
     }
     CalamaresUtils::setAllowLocalTranslation( parser.isSet( debugOption ) || parser.isSet( debugTxOption ) );
-    Calamares::Settings::init( parser.isSet( debugOption ) );
-    a.init();
+
+    return parser.isSet( debugOption );
 }
 
 int
@@ -129,13 +141,14 @@ main( int argc, char* argv[] )
     // TODO: umount anything in /tmp/calamares-... as an emergency save function
 #endif
 
-    KDSingleApplicationGuard guard( KDSingleApplicationGuard::AutoKillOtherInstances );
-    if ( guard.isPrimaryInstance() )
-    {
-        handle_args( a );
-        return a.exec();
-    }
-    else
+    bool is_debug = handle_args( a );
+
+#ifdef WITH_KF5DBus
+    KDBusService service( is_debug ? KDBusService::Multiple : KDBusService::Unique );
+#else
+    KDSingleApplicationGuard guard( is_debug ? KDSingleApplicationGuard::NoPolicy
+                                             : KDSingleApplicationGuard::AutoKillOtherInstances );
+    if ( !is_debug && !guard.isPrimaryInstance() )
     {
         // Here we have not yet set-up the logger system, so qDebug() is ok
         auto instancelist = guard.instances();
@@ -150,4 +163,9 @@ main( int argc, char* argv[] )
         }
         return 69;  // EX_UNAVAILABLE on FreeBSD
     }
+#endif
+
+    Calamares::Settings::init( is_debug );
+    a.init();
+    return a.exec();
 }