(OK) VirtualBox 中的 lineageOS，点击 Developer options，GUI 重启

vim packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java

注释如下代码

/*
        PreferenceScreen convertFbePreference =
            (PreferenceScreen) findPreference(KEY_CONVERT_FBE);

        try {
            IBinder service = ServiceManager.getService("mount");
            IMountService mountService = IMountService.Stub.asInterface(service);
            if (!mountService.isConvertibleToFBE()) {
                removePreference(KEY_CONVERT_FBE);
            } else if ("file".equals(SystemProperties.get("ro.crypto.type", "none"))) {
                convertFbePreference.setEnabled(false);
                convertFbePreference.setSummary(getResources()
                                   .getString(R.string.convert_to_file_encryption_done));
            }
        } catch(RemoteException e) {
            removePreference(KEY_CONVERT_FBE);
        }
*/