MySQL woes - no sock file, or wrong permissions, or... something

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http://crunchbang.org – I'm trying to setup Simple Machines Forum which uses MySQL, which I had installed but it wasn't being used for anything.I forgot the passwords and what not and figured it would be easiest to just start fresh, so I purged all mysql stuff and installed again.It won't start now.  It says "Starting MySQL database server: mysqld . . . . . . . . . . . . . . failed!"When it first started, it went through choosing the root password, then I got this:invoke-rc.d: initscript mysql, action "start" failed. dpkg: error processing mysql-server-5.1 (--configure): subpr (HowTos)