diff -urNr boinc-client_release-7.18-7.18.1-orig/clientgui/BOINCClientManager.cpp boinc-client_release-7.18-7.18.1/clientgui/BOINCClientManager.cpp
--- boinc-client_release-7.18-7.18.1-orig/clientgui/BOINCClientManager.cpp	2021-08-03 17:52:19.000000000 +0200
+++ boinc-client_release-7.18-7.18.1/clientgui/BOINCClientManager.cpp	2022-06-10 01:57:04.426621677 +0200
@@ -199,6 +199,11 @@
 
     if (IsBOINCCoreRunning()) return true;
 
+// Disables for Linux/UNIX the part of code of this function that starts with comment "Unix based systems"
+#ifdef __WXGTK__
+    else return false;
+#endif
+
 #if defined(__WXMSW__)
     const char*  pszExecute = NULL;
     const char*  pszDataDirectory = NULL;