diff -up chromium-89.0.4389.72/chrome/browser/first_run/first_run_internal_linux.cc.etc chromium-89.0.4389.72/chrome/browser/first_run/first_run_internal_linux.cc
--- chromium-89.0.4389.72/chrome/browser/first_run/first_run_internal_linux.cc.etc	2021-03-04 11:12:14.394002900 -0500
+++ chromium-89.0.4389.72/chrome/browser/first_run/first_run_internal_linux.cc	2021-03-04 11:13:00.909220323 -0500
@@ -19,9 +19,9 @@ bool IsOrganicFirstRun() {
 
 base::FilePath InitialPrefsPath() {
   // The standard location of the initial prefs is next to the chrome binary.
+  // ...but we patch it to use /etc/chromium
   base::FilePath initial_prefs;
-  if (!base::PathService::Get(base::DIR_EXE, &initial_prefs))
-    return base::FilePath();
+  initial_prefs = base::FilePath("/etc/chromium");
   return initial_prefs.AppendASCII(installer::kLegacyInitialPrefs);
 }