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init 0
And to reboot:

init 6

These requirements (specs) shouldn't have anything to do w/ Ubuntu, I mean, any distribution would do!
Although I understand that the thread is bit old and you are just inquiring to evaluate, is/was...

If I am not mistaken:

#!/bin/bash
DATE=`which --skip-alias date`
TODAY=`$DATE '+%Y-%m-%d'`
/usr/bin/pg_dump -h localhost -p 5432 -U postgres -F plain -O -v -f...