diff --git a/backends/alpm/pk-backend-error.c b/backends/alpm/pk-backend-error.c
index 255f1fbfa..ac8fd17dc 100644
--- a/backends/alpm/pk-backend-error.c
+++ b/backends/alpm/pk-backend-error.c
@@ -33,140 +33,153 @@ pk_backend_error (PkBackend *self, GError *error)
 	g_return_if_fail (self != NULL);
 	g_return_if_fail (error != NULL);
 
-	if (error->domain == ALPM_ERROR) {
-		switch (error->code) {
-			case PM_ERR_MEMORY:
-			case PM_ERR_SYSTEM:
-				code = PK_ERROR_ENUM_OOM;
-				break;
+	if (error->domain != ALPM_ERROR) {
+		pk_backend_error_code (self, code, "%s", error->message);
+		return;
+	}
 
-			case PM_ERR_BADPERMS:
-				code = PK_ERROR_ENUM_NOT_AUTHORIZED;
-				break;
+	switch (error->code) {
+		case PM_ERR_MEMORY:
+		case PM_ERR_SYSTEM:
+			code = PK_ERROR_ENUM_OOM;
+			break;
 
-			case PM_ERR_NOT_A_FILE:
-			case PM_ERR_NOT_A_DIR:
-				code = PK_ERROR_ENUM_FILE_NOT_FOUND;
-				break;
+		case PM_ERR_BADPERMS:
+			code = PK_ERROR_ENUM_NOT_AUTHORIZED;
+			break;
 
-			case PM_ERR_WRONG_ARGS:
-			case PM_ERR_HANDLE_NULL:
-			case PM_ERR_DB_NULL:
-			case PM_ERR_TRANS_NULL:
-			case PM_ERR_TRANS_NOT_INITIALIZED:
-			case PM_ERR_TRANS_NOT_PREPARED:
-			case PM_ERR_TRANS_NOT_LOCKED:
-			case PM_ERR_INVALID_REGEX:
-				code = PK_ERROR_ENUM_INTERNAL_ERROR;
-				break;
+		case PM_ERR_NOT_A_FILE:
+		case PM_ERR_NOT_A_DIR:
+			code = PK_ERROR_ENUM_FILE_NOT_FOUND;
+			break;
 
-			case PM_ERR_DISK_SPACE:
-				code = PK_ERROR_ENUM_NO_SPACE_ON_DEVICE;
-				break;
+		case PM_ERR_WRONG_ARGS:
+		case PM_ERR_HANDLE_NULL:
+		case PM_ERR_DB_NULL:
+		case PM_ERR_TRANS_NULL:
+		case PM_ERR_TRANS_NOT_INITIALIZED:
+		case PM_ERR_TRANS_NOT_PREPARED:
+		case PM_ERR_TRANS_NOT_LOCKED:
+		case PM_ERR_INVALID_REGEX:
+			code = PK_ERROR_ENUM_INTERNAL_ERROR;
+			break;
 
-			case PM_ERR_HANDLE_NOT_NULL:
-			case PM_ERR_DB_NOT_NULL:
-			case PM_ERR_TRANS_NOT_NULL:
-				code = PK_ERROR_ENUM_FAILED_INITIALIZATION;
-				break;
+		case PM_ERR_DISK_SPACE:
+			code = PK_ERROR_ENUM_NO_SPACE_ON_DEVICE;
+			break;
 
-			case PM_ERR_HANDLE_LOCK:
-				code = PK_ERROR_ENUM_CANNOT_GET_LOCK;
-				break;
+		case PM_ERR_HANDLE_NOT_NULL:
+		case PM_ERR_DB_NOT_NULL:
+		case PM_ERR_TRANS_NOT_NULL:
+			code = PK_ERROR_ENUM_FAILED_INITIALIZATION;
+			break;
 
-			case PM_ERR_DB_OPEN:
-			case PM_ERR_DB_NOT_FOUND:
-			case PM_ERR_PKG_REPO_NOT_FOUND:
-				code = PK_ERROR_ENUM_REPO_NOT_FOUND;
-				break;
+		case PM_ERR_HANDLE_LOCK:
+			code = PK_ERROR_ENUM_CANNOT_GET_LOCK;
+			break;
 
-			case PM_ERR_DB_CREATE:
-				code = PK_ERROR_ENUM_CANNOT_WRITE_REPO_CONFIG;
-				break;
+		case PM_ERR_DB_OPEN:
+		case PM_ERR_DB_NOT_FOUND:
+		case PM_ERR_PKG_REPO_NOT_FOUND:
+			code = PK_ERROR_ENUM_REPO_NOT_FOUND;
+			break;
 
-			case PM_ERR_DB_VERSION:
-			case PM_ERR_DB_REMOVE:
-				code = PK_ERROR_ENUM_REPO_CONFIGURATION_ERROR;
-				break;
+		case PM_ERR_DB_CREATE:
+			code = PK_ERROR_ENUM_CANNOT_WRITE_REPO_CONFIG;
+			break;
 
-			case PM_ERR_DB_WRITE:
-				code = PK_ERROR_ENUM_REPO_NOT_AVAILABLE;
-				break;
+		case PM_ERR_DB_VERSION:
+		case PM_ERR_DB_REMOVE:
+		case PM_ERR_SERVER_BAD_URL:
+		case PM_ERR_SIG_MISSINGDIR:
+			code = PK_ERROR_ENUM_REPO_CONFIGURATION_ERROR;
+			break;
 
-			case PM_ERR_SERVER_BAD_URL:
-				code = PK_ERROR_ENUM_REPO_CONFIGURATION_ERROR;
-				break;
+		case PM_ERR_DB_WRITE:
+			code = PK_ERROR_ENUM_REPO_NOT_AVAILABLE;
+			break;
 
-			case PM_ERR_SERVER_NONE:
-				code = PK_ERROR_ENUM_NO_MORE_MIRRORS_TO_TRY;
-				break;
+		case PM_ERR_SERVER_NONE:
+			code = PK_ERROR_ENUM_NO_MORE_MIRRORS_TO_TRY;
+			break;
 
-			case PM_ERR_TRANS_DUP_TARGET:
-			case PM_ERR_TRANS_ABORT:
-				code = PK_ERROR_ENUM_TRANSACTION_ERROR;
-				break;
+		case PM_ERR_TRANS_DUP_TARGET:
+		case PM_ERR_TRANS_ABORT:
+			code = PK_ERROR_ENUM_TRANSACTION_ERROR;
+			break;
 
-			case PM_ERR_TRANS_TYPE:
-				code = PK_ERROR_ENUM_CANNOT_CANCEL;
-				break;
+		case PM_ERR_TRANS_TYPE:
+			code = PK_ERROR_ENUM_CANNOT_CANCEL;
+			break;
 
-			case PM_ERR_PKG_NOT_FOUND:
-				code = PK_ERROR_ENUM_PACKAGE_NOT_FOUND;
-				break;
+		case PM_ERR_PKG_NOT_FOUND:
+			code = PK_ERROR_ENUM_PACKAGE_NOT_FOUND;
+			break;
 
-			case PM_ERR_PKG_IGNORED:
-				code = PK_ERROR_ENUM_PACKAGE_INSTALL_BLOCKED;
-				break;
+		case PM_ERR_PKG_IGNORED:
+			code = PK_ERROR_ENUM_PACKAGE_INSTALL_BLOCKED;
+			break;
 
-			case PM_ERR_PKG_INVALID:
-			case PM_ERR_PKG_OPEN:
-			case PM_ERR_PKG_INVALID_NAME:
-			case PM_ERR_DLT_INVALID:
-				code = PK_ERROR_ENUM_INVALID_PACKAGE_FILE;
-				break;
+		case PM_ERR_PKG_INVALID:
+		case PM_ERR_PKG_OPEN:
+		case PM_ERR_PKG_INVALID_NAME:
+		case PM_ERR_DLT_INVALID:
+			code = PK_ERROR_ENUM_INVALID_PACKAGE_FILE;
+			break;
 
-			case PM_ERR_PKG_CANT_REMOVE:
-				code = PK_ERROR_ENUM_PACKAGE_FAILED_TO_REMOVE;
-				break;
+		case PM_ERR_PKG_CANT_REMOVE:
+			code = PK_ERROR_ENUM_PACKAGE_FAILED_TO_REMOVE;
+			break;
 
-			case PM_ERR_PKG_INVALID_ARCH:
-				code = PK_ERROR_ENUM_INCOMPATIBLE_ARCHITECTURE;
-				break;
+		case PM_ERR_PKG_INVALID_ARCH:
+			code = PK_ERROR_ENUM_INCOMPATIBLE_ARCHITECTURE;
+			break;
 
-			case PM_ERR_DLT_PATCHFAILED:
-				code = PK_ERROR_ENUM_PACKAGE_FAILED_TO_BUILD;
-				break;
+		case PM_ERR_SIG_INVALID:
+			code = PK_ERROR_ENUM_BAD_GPG_SIGNATURE;
+			break;
 
-			case PM_ERR_UNSATISFIED_DEPS:
-				code = PK_ERROR_ENUM_DEP_RESOLUTION_FAILED;
-				break;
+		case PM_ERR_SIG_UNKNOWN:
+			code = PK_ERROR_ENUM_MISSING_GPG_SIGNATURE;
+			break;
 
-			case PM_ERR_CONFLICTING_DEPS:
-				code = PK_ERROR_ENUM_PACKAGE_CONFLICTS;
-				break;
+		case PM_ERR_DLT_PATCHFAILED:
+			code = PK_ERROR_ENUM_PACKAGE_FAILED_TO_BUILD;
+			break;
 
-			case PM_ERR_FILE_CONFLICTS:
-				code = PK_ERROR_ENUM_FILE_CONFLICTS;
-				break;
+		case PM_ERR_UNSATISFIED_DEPS:
+			code = PK_ERROR_ENUM_DEP_RESOLUTION_FAILED;
+			break;
 
-			case PM_ERR_RETRIEVE:
-			case PM_ERR_LIBFETCH:
-			case PM_ERR_EXTERNAL_DOWNLOAD:
-				code = PK_ERROR_ENUM_PACKAGE_DOWNLOAD_FAILED;
-				break;
+		case PM_ERR_CONFLICTING_DEPS:
+			code = PK_ERROR_ENUM_PACKAGE_CONFLICTS;
+			break;
 
-			case PM_ERR_LIBARCHIVE:
-				code = PK_ERROR_ENUM_LOCAL_INSTALL_FAILED;
-				break;
+		case PM_ERR_FILE_CONFLICTS:
+			code = PK_ERROR_ENUM_FILE_CONFLICTS;
+			break;
 
-			case PM_ERR_CONFIG_INVALID:
-				code = PK_ERROR_ENUM_CANNOT_REMOVE_SYSTEM_PACKAGE;
-				break;
+		case PM_ERR_RETRIEVE:
+		case PM_ERR_LIBCURL:
+		case PM_ERR_EXTERNAL_DOWNLOAD:
+			code = PK_ERROR_ENUM_PACKAGE_DOWNLOAD_FAILED;
+			break;
 
-			case PM_ERR_PKG_HELD:
-				code = PK_ERROR_ENUM_CANNOT_REMOVE_SYSTEM_PACKAGE;
-				break;
-		}
+		case PM_ERR_LIBARCHIVE:
+			code = PK_ERROR_ENUM_LOCAL_INSTALL_FAILED;
+			break;
+
+		case PM_ERR_GPGME:
+			code = PK_ERROR_ENUM_GPG_FAILURE;
+			break;
+
+		case PM_ERR_CONFIG_INVALID:
+			code = PK_ERROR_ENUM_FAILED_CONFIG_PARSING;
+			break;
+
+		case PM_ERR_PKG_HELD:
+			code = PK_ERROR_ENUM_CANNOT_REMOVE_SYSTEM_PACKAGE;
+			break;
 	}
 
 	pk_backend_error_code (self, code, "%s", error->message);