For ages you have to edit /etc/inittab when you plan to use a serial tty under linux. Since Ubuntu Edgy is using upstart there will be no inittab. Upstart is using the concept of events and thus you have to configure an event:
vim /etc/event.d/ttyS0
put this in
# ttyS0 - getty start on runlevel-S start on runlevel-1 start on runlevel-2 start on runlevel-3 start on runlevel-4 start on runlevel-5 stop on shutdown respawn /sbin/getty -L ttyS0 9600 vt100
and start it with
initctl start ttyS0
done.
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