Just to add to your ptoftpd comment...

Ubuntu 6.06 LTS identifies itself as "Debian Unstable" to the ISPconfig installer.  So while ISPconfig is compatable with Ubuntu, it does not know it is being installed on Ubuntu. 

This is a problem because Ubuntu places the proftpd config in /etc/proftpd/prtoftpd.conf while Debian Unstable places it in /etc/proftpd.conf.  As a result, proftpd does not work correctly for ISPconfig installs!!!

I discussed this with ISPconfig support.  I made a suggestion, but they had a better one.  If we execure the following command, we will be linking the config files new location to the old location, making everyone happy, and most importantly, giving your ISPconfig end users the best possible ftp experience.

ln -s /etc/proftpd/proftpd.conf /etc/proftpd.conf

Run this command after you install proftpd.

Thanks go to Ubuntu for their long term support version, LTS is what all admins need to make their life easier.  Thanks also go to ISPconfig for their great control panel, making web reselling affordable again.  And last, but not least, thanks to Falko for showing us how it all comes together in a perfect way!

George