Comment 1 for bug 292155

Thanks for your bug report and for your contribution to ubuntu. In order to determine if this issue is usplash related, would you boot your computer with usplash disabled and then shutdown to see if you can reproduce the issue? To disable usplash for a single boot, you can follow these steps :

1.Press Esc during Grub boot delay to access the boot menu.
2.Select your actual Ubuntu boot line and press "e" to edit it.
3.Select the "kernel" line and press "e" to edit it.
4.At the end of the line, remove "splash" and "quiet" and press "enter".
5.Type "b" to boot the custom boot line.