After the shitstorm of upstart, this is a welcome change
The last reliable version of Ubuntu server was 9.10. 10.04, and all subsequent Ubuntu releases, have the most unreliable boot process imagineable -- known as "upstart." I was a huge Ubuntu advocate until 10.04, now I hate it with a passion thanks to all the times the boot process pauses forever without any indication why or any way to fix the problem (it is still painful 4 years later -- for example try adding an nfs mount to /etc/fstab where the nfs server is having a problem).
I upgraded my Debian system to a version that uses upstart, and it was quite a bit better thanks to the sysvinit compatibility option. Maybe in the future it will be possible to count on Ubuntu actually booting up all the way again.