Some progress on this bug. With the (recent) update the moving the png 
libraries into /lib (for Plymouth), I've been gettings things going further.

Unfortunately tonight it all broke again -- so I decided to figure
things out as much as possible.

I stripped /etc/init/ to a bare minimum: that provided by upstart and
just mountall.conf

i.e.

eve:[~]% ls /etc/init/
control-alt-delete.conf  rc-sysinit.conf  rcS.conf   tty2.conf  tty4.conf  
tty6.conf
mountall.conf            rc.conf          tty1.conf  tty3.conf  tty5.conf  
upstart-udev-bridge.conf

And I still could get booting to work.

I modified tty2.conf to start on starting (like mountall.conf); and
modified the mountall.conf job and prefixed it with strace. It appears
that upstart does not like ptracing though strace and it hangs the job.

That was lucky as I manually went and run the mountall program via
strace (attached).

>From what I see, mountall -- even though it does mount the 'local'
filesystems does not actually regard them as being mounted. So it never
emits any signal saying 'filesystem' and nothing else runs.

For some strange reason, even doing a manual "initctl emit filesystem"
hangs too. Also, Plymouth has actually failed (don't know why but not my
focus for this) to start.

-- 
upstart fails to start system into multiuser mode
https://bugs.launchpad.net/bugs/506727
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