There is no security issue here. If somebody has physical access to your laptop, they can walk away with it, or boot with init=/bin/sh, or remove the hard drive.
The root password offers ZERO protection ** Changed in: sysvinit (Ubuntu) Status: Confirmed => Rejected -- on fscheck a root shell is presented without password https://launchpad.net/bugs/66001 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs