This is still not fixed. I just installed postgresql-9.1 on a brand new
installation of Ubuntu 13.04 (64-bit) and received the following error
when attempting to start the server:

     * Starting PostgreSQL 9.1 database server
     * The PostgreSQL server failed to start. Please check the log output:
    2013-08-26 11:40:41 PDT FATAL:  could not create shared memory segment: 
Invalid
    argument
    2013-08-26 11:40:41 PDT DETAIL:  Failed system call was shmget(key=5432001, 
size
    =41263104, 03600).
    2013-08-26 11:40:41 PDT HINT:  This error usually means that PostgreSQL's 
reques
    t for a shared memory segment exceeded your kernel's SHMMAX parameter.  You 
can
    either reduce the request size or reconfigure the kernel with larger 
SHMMAX.  To
     reduce the request size (currently 41263104 bytes), reduce PostgreSQL's 
shared
    memory usage, perhaps by reducing shared_buffers or max_connections.
        If the request size is already small, it's possible that it is less than
     your kernel's SHMMIN parameter, in which case raising the request size or 
recon
    figuring SHMMIN is called for.
        The PostgreSQL documentation contains more information about shared memo
    ry configuration.
                                                                             
[fail]

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https://bugs.launchpad.net/bugs/264336

Title:
  pgsql fails to start due to shared buffer setting greater than kernel
  allows

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