var/log/postgresql deletion mystery Ubuntu 12.10

Hi,

I have to create this directory each time I want to start the server.
Something is deleting it when I close down or start up my laptop.

Any suggestions as to what could be doing this, or how I could find out? I
presently have version 9.1 installed.

All I can add is "it used to work!". Since then I have upgraded to ubuntu
12.10 from 12.04 and installed mongodb amongst other things.

Regards,

Andy