You could try the workaround found in this article: http://linux.koolsolutions.com/2009/08/04/howto-fix-linux-hangfreeze-during-reboots-and-restarts/ "reboot=bios" fixed the shutdown and reboot hangs for me.
Run in terminal> sudo nano /etc/default/grub Edit this line and save> GRUB_CMDLINE_LINUX="reboot=bios" Run in terminal> sudo update-grub Restart your PC
You could try the workaround found in this article: http:// linux.koolsolut ions.com/ 2009/08/ 04/howto- fix-linux- hangfreeze- during- reboots- and-restarts/ "reboot=bios" fixed the shutdown and reboot hangs for me.
Run in terminal> sudo nano /etc/default/grub LINUX=" reboot= bios"
Edit this line and save> GRUB_CMDLINE_
Run in terminal> sudo update-grub
Restart your PC