I also experienced a blocked system every time i shutdown or reboot my Dell Latitude 6530 with ubuntu 14.10 (64bit), after upgrading from 14.04). If i remove the "quiet splash" kernel option from the grub menu, the last message seen is "wait-for-state stop/waiting".
After installing "systemd-sysv" and a final shutdown problem on invoking "halt", the problem seems to be gone (2 reboots and one halt were successful).
I also experienced a blocked system every time i shutdown or reboot my Dell Latitude 6530 with ubuntu 14.10 (64bit), after upgrading from 14.04). If i remove the "quiet splash" kernel option from the grub menu, the last message seen is "wait-for-state stop/waiting".
After installing "systemd-sysv" and a final shutdown problem on invoking "halt", the problem seems to be gone (2 reboots and one halt were successful).