Fix check mbr with uefi

install/variables/disk.py

@@ -1680,6 +1680,8 @@ class VariableOsInstallMbr(LocationHelper,Variable):
             if len(value) > 1:
                 raise VariableError(
                     _("For Flash install, you need only one disk"))
+        if self.Get('os_install_uefi_set') == 'on':
+            return
         for mbrDisk in value:
             if self.Get('cl_autopartition_set') == 'on':
                 tableOnBootDisk = self.Get('cl_autopartition_table')