Ubuntu 11.10 Postgres 9.1.3 is missing pg_resetxlog; where can I get it?

Greetings.

I installed postgresql-9.1 via apt-get on ubuntu 11.10.

At first, it wouldn't start because of a missing pg_xlog directory. So I
manually created it.

Then, it wouldn't start, because of the following:

2012-03-18 13:18:20 EDT LOG: database system was interrupted; last known up
at 2012-03-18 12:17:07 EDT
2012-03-18 13:18:20 EDT LOG: creating missing WAL directory
"pg_xlog/archive_status"
2012-03-18 13:18:20 EDT LOG: could not open file
"pg_xlog/000000010000000000000001" (log file 0, segment 1): No such file or
directory
2012-03-18 13:18:20 EDT LOG: invalid primary checkpoint record
2012-03-18 13:18:20 EDT LOG: could not open file
"pg_xlog/000000010000000000000001" (log file 0, segment 1): No such file or
directory
2012-03-18 13:18:20 EDT LOG: invalid secondary checkpoint record
2012-03-18 13:18:20 EDT PANIC: could not locate a valid checkpoint record
2012-03-18 13:18:20 EDT LOG: startup process (PID 3343) was terminated by
signal 6: Aborted
2012-03-18 13:18:20 EDT LOG: aborting startup due to startup process
failure

After searching, I found a recommendation to execute 'pf_resetxlog', but
that utility is nowhere to be found, even by using 'find' on the entire HDD.

Now I am at a standstill.

Where can I find ''pg_resetxlog"?

Many thanks for any help.

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