Vijaykumar Jain <vjain(at)opentable(dot)com> writes:
> I do not know if this list is also for asking ubuntu package related queries.
Not really; you'd be better off filing a bug with ubuntu where their
packager(s) will see it.
The symptoms you describe definitely look like there is something
wrong with a packager-supplied configuration adjustment script.
More than that is hard to say without familiarity with the ubuntu
postgres packages, which I lack.
regards, tom lane