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I installed manually following  the steps in the official Installation Guide
(Manually because safemode is on at my webhost).
There are some minor differences in the guide, seems to come from Mambo 4.52:
.  joomal.sql instead of mambo sql
. there was nothing like
  "Edit the file sql/mambo.sql and uncomment the very last 6 lines of the file starting:
    INSERT INTO `mos_users` VALUES (62, 'Administrator'  "
in joomla.sql

Everything looked fine until the point I should log in as admin with pw admin

There I got a pop up with the message "You cannot login, there are no administrators defined"

also, if I tried to log to the front end I got:

DB function failed with error number 1146
Table 'joomdb.jos_session' doesn't exist SQL=SELECT session_id FROM jos_session WHERE session_id = MD5( '49c2f3a9943deeb2cad7057a724f902b' )
SQL =

SELECT session_id
FROM jos_session
WHERE session_id = MD5( '49c2f3a9943deeb2cad7057a724f902b' )

Pls help (if can