Thanks, till and falco!
The /var/log/ispconfig_install.log is very useful.
The first error is due to «Line 1037: WARNING: could not read in db_ispconfig.sql». Then I've manually created the database. The second error: «db ipcf already exists!», and my manual dump that have problems --can't change the IP and server name with ISPConfig web.
The last installation after your recommendations is correct, thanks
(PS: about this thread title: is ./setup, not ./install! %-)