I upgraded from Maverick to Natty recently and everything went fine except during the dist-upgrade something went wrong with PostgreSQL. I've since tried reinstalling, removing, and even purging it via 'sudo apt-get purge postgresql' but it still comes up with the same error no matter what I do. See below. It was working fine before the upgrade. Any help would be greatly appreciated. Thanks!
Setting up postgresql-common (114) ... * Starting PostgreSQL 8.4 database server * The PostgreSQL server failed to start. Please check the log output: 2011-05-19 11:49:41 EDT LOG: could not bind IPv4 socket: Address already in use 2011-05-19 11:49:41 EDT HINT: Is another postmaster already running on port 5432? If not, wait a few seconds and retry. 2011-05-19 11:49:41 EDT WARNING: could not create listen socket for "127.0.0.1" 2011-05-19 11:49:41 EDT FATAL: could not create shared memory segment: Invalid argument 2011-05-19 11:49:41 EDT DETAIL: Failed system call was shmget(key=5432001, size=37879808, 03600). 2011-05-19 11:49:41 EDT HINT: This error usually means that PostgreSQL's request 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 37879808 bytes), reduce PostgreSQL's shared_buffers parameter (currently 4096) and/or its max_connections parameter (currently 103). 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 reconfiguring SHMMIN is called for. The PostgreSQL documentation contains more information about shared memory configuration. [fail] invoke-rc.d: initscript postgresql, action "start" failed. dpkg: error processing postgresql-common (--configure): subprocess installed post-installation script returned error exit status 1