Configure FTP on Ubuntu to default to a certain directory

Configure FTP on Ubuntu to default to a certain directory

I am trying to configure an FTP server on my 12.04.3 LTS machine. I am
hosting a website from /home/webuser/public/mywebsite.com/public. Now, I
want to configure the FTP server in such a way where, when an FTP user
logs in, they arrive in the /home/webuser/public/mywebsite.com/public
directory (and that's the ONLY directory that they should be able to
access).
I've tried vsftpd and pure-ftp, and I haven't had much luck. It seems that
most processes involve creating a new, FTP specific user account, and the
home directory is used to publish files to. I can do that, but I need the
uploaded files to go into the webuser's public folder.
Does anyone know how I can accomplish this?