If you mount efivarsfs read-only, efibootmgr can&#x27;t make your system bootable.  So at a minimum, you can&#x27;t <i>just</i> remount the filesystem read-only; you need distribution integration so efibootmgr can still write to it.<p>There&#x27;s no point in mounting efivarsfs read-only; you might as well not mount it at all.